Hot melt pressure sensitive adhesive which exhibits minimal staining
First Claim
1. A hot melt pressure sensitive adhesive comprising:
- a. from about 5% to about 30% by weight of the adhesive of at least one block copolymer having styrene end-blocks and ethylene/butylene or ethylene/propylene mid-blocks and having a diblock content of greater than 35%, a coupling efficiency of less than about 50%, a melt index greater than about 20 grams/10 minutes, and a styrene content of from about 10 wt-% to about 30 wt-%, b. from about 5% to about 50% by weight of the adhesive of at least one block copolymer having styrene end-blocks, a coupling efficiency from about 65% to about 100%;
from about 10% to about 40% by weight of the adhesive of a liquid plasticizing oil; and
c. from about 20% to about 60% by weight of the adhesive of a tackifying resin, said adhesive has a 180°
peel to stainless steel of less than about 2.0 pounds per linear inch (about 360 g/cm) and exhibits minimal staining to paper.
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Accused Products
Abstract
This invention relates to a removable grade hot melt pressure sensitive adhesive comprising from about 5% to about 30% by weight of the adhesive of a block copolymer having styrene endblocks and ethylene/butylene or ethylene/propylene midblocks and having a coupling efficiency of less than about 65% and a melt index of greater than about 20 grams/10 minutes; from about 10% to about 50% by weight of the adhesive of at least one block copolymer having styrene endblocks and a coupling efficiency from about 65% to about 100%; from about 20% to about 60% by weight of the adhesive of a tackifying resin and from about 10% to about 40% by weight of the adhesive of a liquid plasticizing oil.
96 Citations
27 Claims
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1. A hot melt pressure sensitive adhesive comprising:
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a. from about 5% to about 30% by weight of the adhesive of at least one block copolymer having styrene end-blocks and ethylene/butylene or ethylene/propylene mid-blocks and having a diblock content of greater than 35%, a coupling efficiency of less than about 50%, a melt index greater than about 20 grams/10 minutes, and a styrene content of from about 10 wt-% to about 30 wt-%, b. from about 5% to about 50% by weight of the adhesive of at least one block copolymer having styrene end-blocks, a coupling efficiency from about 65% to about 100%;
from about 10% to about 40% by weight of the adhesive of a liquid plasticizing oil; and
c. from about 20% to about 60% by weight of the adhesive of a tackifying resin, said adhesive has a 180°
peel to stainless steel of less than about 2.0 pounds per linear inch (about 360 g/cm) and exhibits minimal staining to paper.- View Dependent Claims (2, 5, 6, 7, 8, 9, 26, 27)
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3. A removable label comprising a substrate coated on at least one surface with a hot melt pressure sensitive adhesive comprising
a. from about 5% to about 30% by weight of the adhesive of at least one block copolymer having styrene endblocks and ethylene/butylene or ethylene/propylene midblocks and having a coupling efficiency of less than about 50% and a melt index greater than about 20 grams/10 minutes; -
b. from about 5% to about 50% by weight of the adhesive of at least one block copolymer having styrene endblocks and a coupling efficiency from about 65% to about 100%;
c. from about 10% to about 40% by weight of the adhesive of a liquid plasticizing oil; and
d. from about 20% to abut 60% by weight of the adhesive of a tackifying resin;
wherein the resultant adhesive has a 180°
peel to stainless steel of less than about 2.0 pounds per linear inch (about 360 g/cm) and exhibits minimal staining to paper.- View Dependent Claims (16, 17, 18, 19, 20)
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4. An article adhered to a magazine page through “
- tipping”
with a removable hot melt pressure sensitive adhesive comprising;a. from about 5% to about 30% by weight of the adhesive of at least one block copolymer having styrene endblocks and ethylene/butylene or ethylene/propylene midblocks and having a coupling efficiency of less than about 50% and a melt index greater than about 20 grams/10 minutes;
b. from about 5% to about 50% by weight of the adhesive of at least one block copolymer having styrene endblocks and a coupling efficiency from about 65% to about 100%;
c. from about 10% to about 40% by weight of the adhesive of a liquid plasticizing oil; and
d. from about 20% to about 60% by weight of the adhesive of a tackifying resin;
wherein the resultant adhesive has a 180°
peel to stainless steel of less than about 2.0 pounds per lineal inch (about 360°
g/cm) and exhibits minimal staining to paper.- View Dependent Claims (21, 22, 23, 24, 25)
- tipping”
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10. A non-staining hot melt adhesive that can be coated on a label or sticker, applied to a substrate, and removed without leaving a residue behind or causing more than acceptable staining, comprising:
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a. from about 25% to about 35% by weight of the adhesive of at least one block copolymer having styrene endblocks and isoprene midblocks, a styrene content of 5-16 wt-%, a diblock content of greater than about 40 wt-%, and a molecular weight of greater than 200,000;
b. from about 20% to about 70% by weight of the adhesive of at least one tackifying resin; and
c. from about 5% to about 40% by weight of the adhesive of at least one plasticizing oil. - View Dependent Claims (11, 12)
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13. A hot melt adhesive characterized by causing minimal staining and having at least acceptable anti-bleeding properties when evaluated in accordance with Staining Tests A and B herein, comprising;
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a. from about 10% to about 60% by weight of at least one block copolymer from about 10% to about 60% by weight of at least one block copolymer having midblocks selected from the class consisting of ethylene/butylene and ethylene/propylene, a melt index greater than about 30 g/10 minutes, a coupling efficiency less than about 35% a styrene content of from about 10% to about 30% by weight of the copolymer, and a molecular weight of less than 150,000 g/mole;
b. from about 25% to about 45% by weight of the adhesive of at least one tackifying resin having a softening point less than 100°
C.; and
c. from about 20% to about 30% by weight of the adhesive of at least one plasticizing oil. - View Dependent Claims (14, 15)
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Specification