Adhesive for bonding to low surface energy surfaces
First Claim
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1. An article comprising a pressure sensitive adhesive in combination with a backing having first and second major surfaces, the adhesive having a rubber phase and comprising:
- (a) 100 parts by weight of a polymodal asymmetric elastomeric block copolymer;
(b) at least one tackifier capable of increasing the Tg of the rubber phase of the adhesive, said at least one tackifier being present in an amount sufficient to raise the calculated Fox Tg of the rubber phase of the adhesive to greater than 245°
K;
(c) 0 to about 50 parts by weight of a crosslinking agent; and
(d) 0 to about 300 parts by weight of a plasticizer;
wherein the polymodal asymmetric elastomeric block copolymer has the formula QnY and comprises from about 4 to about 40 percent by weight of a polymerized monovinyl aromatic compound and from about 96 to about 60 percent by weight of polymerized conjugated diene, wherein;
Q represents an individual arm of the block copolymer and has the formula S-B;
n represents the number of arms Q in the block copolymer and is a whole number of at least 3; and
Y is the residue of a multifunctional coupling agent; and
further wherein;
(a) S is a nonelastomeric polymer segment endblock of a polymerized monovinyl aromatic homopolymer, there being at least two different molecular weight endblocks in the copolymer, a higher molecular weight endblock and a lower molecular weight endblock, wherein;
(i) the number average molecular weight of the higher molecular weight endblock (Mn)H is in the range of from about 5,000 to about 50,000;
(ii) the number average molecular weight of the lower molecular weight endblock (Mn)L is in the range of from about 1,000 to about 10,000; and
(iii) the ratio (Mn)H/(Mn)L is at least 1.25; and
(b) B is an elastomeric polymer segment midblock which connects each arm to the residue of a multifunctional coupling agent (Y) and comprises a polymerized conjugated diene or combination of conjugated dienes; and
wherein the adhesive forms a layer on at least a portion of at least one of the major surfaces of the backing and the article exhibits a 180°
peel adhesion on high density polyethylene of at least 80 N/dm.
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Abstract
A novel polymodal asymmetric elastomeric block copolymer and a pressure sensitive adhesive, tape and adhesive backed article made therefrom, such as a polymer foam article having a substantially smooth surface prepared by melt-mixing a polymer composition and a plurality of microspheres, at least one of which is an expandable polymeric microsphere, under process conditions, including temperature and shear rate, selected to form an expandable extrudable composition; and extruding the composition through a die.
92 Citations
29 Claims
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1. An article comprising a pressure sensitive adhesive in combination with a backing having first and second major surfaces, the adhesive having a rubber phase and comprising:
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(a) 100 parts by weight of a polymodal asymmetric elastomeric block copolymer; (b) at least one tackifier capable of increasing the Tg of the rubber phase of the adhesive, said at least one tackifier being present in an amount sufficient to raise the calculated Fox Tg of the rubber phase of the adhesive to greater than 245°
K;(c) 0 to about 50 parts by weight of a crosslinking agent; and (d) 0 to about 300 parts by weight of a plasticizer; wherein the polymodal asymmetric elastomeric block copolymer has the formula QnY and comprises from about 4 to about 40 percent by weight of a polymerized monovinyl aromatic compound and from about 96 to about 60 percent by weight of polymerized conjugated diene, wherein; Q represents an individual arm of the block copolymer and has the formula S-B; n represents the number of arms Q in the block copolymer and is a whole number of at least 3; and Y is the residue of a multifunctional coupling agent; and
further wherein;(a) S is a nonelastomeric polymer segment endblock of a polymerized monovinyl aromatic homopolymer, there being at least two different molecular weight endblocks in the copolymer, a higher molecular weight endblock and a lower molecular weight endblock, wherein; (i) the number average molecular weight of the higher molecular weight endblock (Mn)H is in the range of from about 5,000 to about 50,000; (ii) the number average molecular weight of the lower molecular weight endblock (Mn)L is in the range of from about 1,000 to about 10,000; and (iii) the ratio (Mn)H/(Mn)L is at least 1.25; and (b) B is an elastomeric polymer segment midblock which connects each arm to the residue of a multifunctional coupling agent (Y) and comprises a polymerized conjugated diene or combination of conjugated dienes; and wherein the adhesive forms a layer on at least a portion of at least one of the major surfaces of the backing and the article exhibits a 180°
peel adhesion on high density polyethylene of at least 80 N/dm. - View Dependent Claims (2, 3, 4, 5, 26, 27, 28)
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6. An article comprising a pressure sensitive adhesive in combination with a backing having first and second major surfaces, wherein the backing is in the form of a foam, at least one of the major surfaces of which is substantially smooth having an Ra value less than about 75 micrometers, as measured by laser triangulation profilometry, and the foam comprises a plurality of microspheres, at least one of which is an expandable polymeric microsphere, the adhesive having a rubber phase and comprising:
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(a) 100 parts by weight of a polymodal asymmetric elastomeric block copolymer; (b) at least one tackifier capable of increasing the Tg of the rubber phase of the adhesive, said at least one tackifier being present in an amount sufficient to raise the calculated Fox Tg of the rubber phase of the adhesive to greater than 245°
K;(c) 0 to about 50 parts by weight of a crosslinking agent; and (d) 0 to about 300 parts by weight of a plasticizer; wherein the polymodal asymmetric elastomeric block copolymer has the formula QnY and comprises from about 4 to about 40 percent by weight of a polymerized monovinyl aromatic compound and from about 96 to about 60 percent by weight of polymerized conjugated diene, wherein; Q represents an individual arm of the block copolymer and has the formula S-B; n represents the number of arms Q in the block copolymer and is a whole number of at least 3; and Y is the residue of a multifunctional coupling agent; and
further wherein;(a) S is a nonelastomeric polymer segment endblock of a polymerized monovinyl aromatic homopolymer, there being at least two different molecular weight endblocks in the copolymer, a higher molecular weight endblock and a lower molecular weight endblock, wherein; (i) the number average molecular weight of the higher molecular weight endblock (Mn)H is in the range of from about 5,000 to about 50,000; (ii) the number average molecular weight of the lower molecular weight endblock (Mn)L is in the range of from about 1,000 to about 10,000; and (iii) the ratio (Mn)H/(Mn)L is at least 1.25; and (b) B is an elastomeric polymer segment midblock which connects each arm to the residue of a multifunctional coupling agent (Y) and comprises a polymerized conjugated diene or combination of conjugated dienes; wherein the adhesive forms a layer on at least a portion of at least one of the major surfaces of the backing and the article exhibits a 180°
peel adhesion on high density polyethylene of at least 80 N/dm. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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7. An article comprising a pressure sensitive adhesive in the form of a foam having at least one substantially smooth major surface having an Ra value less than about 75 micrometers, as measured by laser triangulation profilometry, the foam comprising a plurality of expandable polymeric microspheres in combination with at least one other polymer composition in the form of a plurality of discrete structures bonded to or embedded in the foam, and the adhesive having a rubber phase and comprising:
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(a) 100 parts by weight of a polymodal asymmetric elastomeric block copolymer; (b) at least one tackifier capable of increasing the Tg of the rubber phase of the adhesive, said at least one tackifier being present in an amount sufficient to raise the calculated Fox Tg of the rubber phase of the adhesive to greater than 245°
K;(c) 0 to about 50 parts by weight of a crosslinking agent; and (d) 0 to about 300 parts by weight of a plasticizer; wherein the polymodal asymmetric elastomeric block copolymer has the formula QnY and comprises from about 4 to about 40 percent by weight of a polymerized monovinyl aromatic compound and from about 96 to about 60 percent by weight of polymerized conjugated diene, wherein; Q represents an individual arm of the block copolymer and has the formula S-B; n represents the number of arms Q in the block copolymer and is a whole number of at least 3; and Y is the residue of a multifunctional coupling agent; and
further wherein;(a) S is a nonelastomeric polymer segment endblock of a polymerized monovinyl aromatic homopolymer, there being at least two different molecular weight endblocks in the copolymer, a higher molecular weight endblock and a lower molecular weight endblock, wherein; (i) the number average molecular weight of the higher molecular weight endblock (Mn)H is in the range of from about 5,000 to about 50,000; (ii) the number average molecular weight of the lower molecular weight endblock (Mn)L is in the range of from about 1,000 to about 10,000; and (iii) the ratio (Mn)H/(Mn)L is at least 1.25; and (b) B is an elastomeric polymer segment midblock which connects each arm to the residue of a multifunctional coupling agent (Y) and comprises a polymerized conjugated diene or combination of conjugated dienes; wherein the foam adhesive exhibits a 180°
peel adhesion on high density polyethylene of at least 80 N/dm.
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17. An article comprising a foam backing having first and second major surfaces and an adhesive layer on at least a portion of at least one of the major surfaces wherein the article exhibits a 180°
- peel adhesion on high density polyethylene of at least 80 N/dm, and at least one of the foam backing or adhesive has a rubber phase and comprises;
(a) 100 parts by weight of a polymodal asymmetric elastomeric block copolymer; (b) at least one tackifier capable of increasing the Tg of the rubber phase of the adhesive, said at least one tackifier being present in an amount sufficient to raise the calculated Fox Tg of the rubber phase to greater than 245°
K;(c) 0 to about 50 parts by weight of a crosslinking agent; and (d) 0 to about 300 parts by weight of a plasticizer; wherein the polymodal asymmetric elastomeric block copolymer has the formula QnY and comprises from about 4 to about 40 percent by weight of a polymerized monovinyl aromatic compound and from about 96 to about 60 percent by weight of polymerized conjugated diene, wherein; Q represents an individual arm of the block copolymer and has the formula S-B; n represents the number of arms Q in the block copolymer and is a whole number of at least 3; and Y is the residue of a multifunctional coupling agent; and
further wherein;(a) S is a nonelastomeric polymer segment endblock of a polymerized monovinyl aromatic homopolymer, there being at least two different molecular weight endblocks in the copolymer, a higher molecular weight endblock and a lower molecular weight endblock, wherein; (i) the number average molecular weight of the higher molecular weight endblock (Mn)H is in the range of from about 5,000 to about 50,000; (ii) the number average molecular weight of the lower molecular weight endblock (Mn)L is in the range of from about 1,000 to about 10,000; and (iii) the ratio (Mn)H/(Mn)L is at least 1.25; and (b) B is an elastomeric polymer segment midblock which connects each arm to the residue of a multifunctional coupling agent (Y) and comprises a polymerized conjugated diene or combination of conjugated dienes. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 29)
- peel adhesion on high density polyethylene of at least 80 N/dm, and at least one of the foam backing or adhesive has a rubber phase and comprises;
Specification