Radiation-curable acrylate/silicone pressure-sensitive adhesive compositions
First Claim
1. A pressure-sensitive adhesive formed from the free radical polymerization of a composition comprising:
- (a) at least about 20 weight percent of polymer selected from the group consisting of polymers falling within the general formula ##STR20## and mixtures thereof, wherein;
X are monovalent moieties having ethylenic unsaturation which can be the same or different;
Y are divalent linking groups which can be the same or different and which serve to activate X toward free radical polymerization;
D are monovalent moieties which can be the same or different selected from the group consisting of hydrogen, an alkyl group of 1 to about 10 carbon atoms, and aryl;
R are divalent hydrocarbon groups which can be the same or different;
R1 are monovalent moieties which can be the same or elected from the group consisting of alkyl and aryl;
R2 are monovalent moieties which can be the same or different selected from the group consisting of alkyl and aryl;
R3 are monovalent moieties which can be the same or different selected from the group consisting of alkyl vinyl, and aryl;
R4 are monovalent moieties which can be the same or different selected from the group consisting of alkyl vinyl, and aryl; and
n is an integer of about 200 to about 1000;
(b) about 0.5 to about 80 weight percent of monofunctional free radically polymerizable vinyl monomer which is capable of copolymerizing with said polymer; and
(c) 80 to 200 parts per 100 parts by weight of element (a) of silicate MQ tackifying resin to impart a degree of adhesive tack to the cured composition at the use temperature;
wherein said weight percentages set forth in element (a) and element (b) are based upon the combined weights of said polymer of element (a) and said monomer of element (b).
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Abstract
The present invention provides a radiation curable vinyl-silicone pressure-sensitive adhesive composition which combines the advantages of silicone and acrylate pressure-sensitive adhesives and which does not experience gross phase separation problems. The composition comprises at least about 20 weight percent of a certain telechelic silicone polymer, about 0.5 to about 80 weight percent of monofunctional free-radically polymerizable vinyl monomer copolymerizable with the silicone polymer, and a sufficient amount of a silicate MQ tackifying resin to impart a degree of adhesive tack to the cured composition at the use temperature, wherein the weight percentages of the silicone polymer and the monomer are based upon the total weight of the silicone polymer and monomer.
140 Citations
23 Claims
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1. A pressure-sensitive adhesive formed from the free radical polymerization of a composition comprising:
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(a) at least about 20 weight percent of polymer selected from the group consisting of polymers falling within the general formula ##STR20## and mixtures thereof, wherein;
X are monovalent moieties having ethylenic unsaturation which can be the same or different;Y are divalent linking groups which can be the same or different and which serve to activate X toward free radical polymerization; D are monovalent moieties which can be the same or different selected from the group consisting of hydrogen, an alkyl group of 1 to about 10 carbon atoms, and aryl; R are divalent hydrocarbon groups which can be the same or different; R1 are monovalent moieties which can be the same or elected from the group consisting of alkyl and aryl; R2 are monovalent moieties which can be the same or different selected from the group consisting of alkyl and aryl; R3 are monovalent moieties which can be the same or different selected from the group consisting of alkyl vinyl, and aryl; R4 are monovalent moieties which can be the same or different selected from the group consisting of alkyl vinyl, and aryl; and n is an integer of about 200 to about 1000; (b) about 0.5 to about 80 weight percent of monofunctional free radically polymerizable vinyl monomer which is capable of copolymerizing with said polymer; and (c) 80 to 200 parts per 100 parts by weight of element (a) of silicate MQ tackifying resin to impart a degree of adhesive tack to the cured composition at the use temperature; wherein said weight percentages set forth in element (a) and element (b) are based upon the combined weights of said polymer of element (a) and said monomer of element (b). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification