Pressure-sensitive adhesive compositions and constructions
First Claim
Patent Images
1. A pressure-sensitive adhesive composition comprising:
- a) about 10 to about 40 wt. % of a styrene-isoprene block copolymer having a styrene content of from about 14% to about 20% by weight;
b) about 5 to about 30 wt. % of a styrene-butadiene block copolymer;
c) about 30 to about 65 wt. % of an aromatically modified tackifying resin; and
,d) about 8 to about 30 wt. % of a plasticizing oil.
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Abstract
The present invention is directed to pressure-sensitive adhesive compositions and pressure-sensitive adhesive constructions fabricated using the pressure-sensitive adhesive compositions. The pressure-sensitive adhesive compositions comprise about 10 to about 40% of a styrene-isoprene block copolymer, about 5 to about 30% of a styrene-butadiene block copolymer, about 30 to about 65% of an aromatically modified tackifying resin, about 8 to about 30% of a plasticizing oil and optionally about 0.2 to about 2% of an antioxidant, wherein the percentages are based on the total weight of the composition.
55 Citations
55 Claims
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1. A pressure-sensitive adhesive composition comprising:
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a) about 10 to about 40 wt. % of a styrene-isoprene block copolymer having a styrene content of from about 14% to about 20% by weight; b) about 5 to about 30 wt. % of a styrene-butadiene block copolymer; c) about 30 to about 65 wt. % of an aromatically modified tackifying resin; and
,d) about 8 to about 30 wt. % of a plasticizing oil. - 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, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A pressure-sensitive adhesive composition comprising:
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a) about 10 to about 40 wt. % of a styrene-isoprene block copolymer having about 5 to about 80% by weight styrene-isoprene diblock component having a styrene content of from about 14% to about 20% by weight; b) about 5 to about 30 wt. % of a styrene-butadiene block copolymer having from about 20 to about 35 wt. % bound styrene and about 15 to about 20 wt. % block styrene; c) about 30 to about 65 wt. % of an aromatically modified tackifying resin having between about 6 to about 35% aromatic content and a softening point above about 85°
C.; andd) about 8 to about 30 wt. % of a plasticizing oil, wherein said composition expresses a single glass transition temperature and has a tangent δ
value of greater than about 0.5 for all temperatures in the range of about −
20°
C. to about 100°
C.- View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A pressure-sensitive adhesive construction comprising:
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a) a face stock; and b) a pressure-sensitive adhesive layer coated on at least one surface of said face stock, said pressure-sensitive adhesive comprising; i) about 10 to about 40 wt. % of a styrene-isoprene block copolymer having a styrene content of from about 14% to about 20% by weight; ii) about 5 to about 30 wt. % of a styrene-butadiene block copolymer; iii) about 30 to about 65 wt. % of an aromatically modified tackifying resin; and
,iv) about 8 to about 30 wt. % of a plasticizing oil. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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Specification