Adhesives, their preparation and use

Details Adhesives, their preparation and use Adhesives, their preparation and use

1988-11-14

1990-04-03

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 75, C08G 1804

Patent

active

049141732

ABSTRACT:
Skin friendly pressure sensitive adhesives in the form of inherently tacky polyurethane-containing gells may be prepared by reacting an isocyanate prepolymer, which is itself the reaction product of poly-functional isocyanate and polyoxyalkylene diol monoalkyl ether, with a hydroxyl-containing ester of acrylic or methacrylic acid and optionally other hydroxyl containing compounds and then cross-linking the polymer so formed by means of irradiation. The proportion of acrylate chosen is such that it will react with at least 15 to 25% of the free isocyanate groups in the prepolymer and the remainder react with the other hydroxyl containing compound. The adhesives are capable of absorbing up to 95%, typically from 35 to 95% by weight of water when hydrated. The use of the adhesive in highly moisture vapor permeable dressings is also disclosed.

REFERENCES:
patent: 4192762 (1980-05-01), Osborn
patent: 4465718 (1984-08-01), Gruber
patent: 4672001 (1987-06-01), Bravet et al.
Chemical Abstract 92999q--abstract of Japanese Patent 734 7538.

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