Hydrocolloid pressure sensitive adhesives
First Claim
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1. A pressure sensitive adhesive material which is free of mineral oil and comprises:
- 1) a continuous phase formed from (a) 10 to 30 wt % of a physically cross-linked solid rubber comprising a blend of linear or radial A-B-A block copolymers and 15 to 85% by weight, based on the total weight of component (a) of A-B block copolymer;
(b) 18 to 40% of a compatible tackifying resin;
(c) 20 to 60% of a low-molecular weight polyisobutylene; and
(d) 0 to 50% by weight of butyl rubber modifier, and 2) 15 to 70%, based on the total weight of the adhesive, of a discontinuous phase comprising one or more hydrocolloids that are soluble and/or swellable in water, all percentages being by weight and those of components (a) to (d) being based on the total weight of the continuous phase.
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Abstract
A pressure-sensitive adhesive material made of a weakly elastic mixture comprising a continuous phase formed essentially from a physically cross-linked solid rubber, which comprises a blend of A-B-A block copolymer, such as a styrene-isoprene-styrene block copolymer and a diblock copolymer such as styrene-butadiene, styrene-isoprene or a hydrogenated styrene-diene copolymer such as styrenel/etyhlene butylene, a compatible tackifying resin and a low-molecular weight polyisobutylene, optionally modified by butyl rubber, and a discontinuous phase comprising one or more hydrocolloids that are soluble and/or swellable in water.
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18 Claims
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1. A pressure sensitive adhesive material which is free of mineral oil and comprises:
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1) a continuous phase formed from (a) 10 to 30 wt % of a physically cross-linked solid rubber comprising a blend of linear or radial A-B-A block copolymers and 15 to 85% by weight, based on the total weight of component (a) of A-B block copolymer;
(b) 18 to 40% of a compatible tackifying resin;
(c) 20 to 60% of a low-molecular weight polyisobutylene; and
(d) 0 to 50% by weight of butyl rubber modifier, and 2) 15 to 70%, based on the total weight of the adhesive, of a discontinuous phase comprising one or more hydrocolloids that are soluble and/or swellable in water, all percentages being by weight and those of components (a) to (d) being based on the total weight of the continuous phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification