Hot melt adhesive comprising water soluble polyalkyloxazoline and water insoluble polymer
AssigneeH. B. Fuller Licensing & Financing, Inc.
InventorsSteven L. Scholl, Eugene R. Simmons, Keith C. Knutson, William L. Bunnelle
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Abstract
Normally water insoluble hot melt adhesive compositions containing structural polymers such as A-B-A block copolymers, butyl rubbers, polyesters, ethylene vinyl acetates, ethylene acrylic acid polymers can be made sensitive to the action of water using an effective water sensitizing amount of a polyalkyloxazoline polymer in the hot melt adhesive. The polyalkyloxazoline polymer can be incorporated into a single phase adhesive composition with the structural polymer using an effective amount of a hydroxyl or carboxylic acid compound.
Claims22
An aqueous alkali dispersible hot melt adhesive composition comprising:
- (a) about 10-30 wt % of a thermoplastic aqueous insoluble polymer having a molecular weight of about 10,000 to 200,000, a glass transition temperature of about -90.degree. to 100.degree. C. and a melt index of about l1 to 125 (g/10 minutes @190.degree. C.) wherein said thermoplastic aqueous insoluble polymer is present in a concentration less than that necessary to form a nondispersible elastic;
- (b) about 1-75 wt % of an N-substituted polyalkyleneimine of the formula:
- ##STR4## wherein n is about 2-3, m is about 100-10,000, and R is a C.sub.1-3 alkyl group;
- (c) about 2-90 wt % of a functional diluent selected from the group consisting of an acid functional organic compound having an acid number of at least 75 and a hydroxy substituted organic compound having a hydroxyl number of 150 or greater;
- and
- (d) about 0-60 wt % of a compatible plasticizer or tackifier.
A water resistant, aqueous alkali-dispersible hot melt adhesive composition consisting essentially of:
- (a) about 10-30 wt % of a thermoplastic rubbery block copolymer selected rom the group consisting of styrene-isoprene-styrene block copolymers, styrene-butadiene-styrene block copolymers, and styrene-ethylenebutylene-styrene block copolymers wherein said thermoplastic aqueous insoluble polymer is present in a concentration less than that necessary to form a nondispersible elastic;
- (b) about 5-75 wt % of a polyalkyloxazoline polymer of the formula:
- ##STR5## wherein n is about 2-3, m is about 100-10,000, and R is a C.sub.1-3 alkyl group;
- (c) about 2-90 wt % of a functional diluent selected from the group consisting of an acid functional organic compound having an acid number of at least 75, said acid functional organic compound selected from the group consisting of a C.sub.12 fatty acid, a dimer acid prepared from a C.sub.12-24 unsaturated fatty acid, a polymeric composition having a pendent carboxylic acid functionality, or mixtures thereof, and a hydroxy substituted organic compound having a hydroxyl number of at least 150, said hydroxy compound selected from the group consisting of a hydroxyl wax, a C.sub.10-30 fatty acid alcohol, a hydroxy substituted glyceride, a hydroxy substituted fatty acid, a hydroxy substituted fat, a hydroxy substituted fatty amide, a polyalkylene oxide polymer or copolymer or combinations thereof;
- and
- (d) about 0-60 wt % of a compatible plasticizer or tackifier.
Dependencies are inferred from the claim text.