Heat resistant hot melt adhesives
AssigneeNational Starch and Chemical Corporation
InventorsPaul P. Puletti, Catherine Stubler Salerno
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Abstract
Conventional hot melt adhesive formulations based on A-B-A type block copolymers are improved with respect to their heat and plasticizer resistance by addition thereto of a polymeric fatty acid polyamide.
Claims11
A hot-melt adhesive composition with improved heat resistance comprising 10-55% of a block copolymer having the general configuration A-B-A wherein A is a non-elastomeric polymer block derived from the moieties of a monovinyl aromatic hydrocarbon monomer, and B is an elastomeric polymer block derived from the moieties of a conjugated diene monomer or a hydrogenated derivative thereof;
- 20-70% of a tackifying resin;
- 0-25% plasticizing oil;
- 0-50% wax diluent;
- and 0-3% antioxidant;
- wherein the improvement comprises the present of 1-20% of a polymeric fatty acid polyamide.
A hot-melt adhesive composition with improved heat resistance comprising 10-40% of a block copolymer having the general configuration A-B-A wherein A is a non-elastomeric polymer block derived from the moieties of a monovinyl aromatic hydrocarbon monomer, and B is an elastomeric polymer block derived from the moieties of a conjugated diene monomer or hydrogenated derivative thereof;
- 30-50% of a tackifying resin selected from the group consisting of natural and modified rosins and the glycerol and pentaerythritol esters of natural and modified rosins;
- 15-25% of an aliphatic petroleum hydrocarbon resin having a Ball and Ring softening point of from 70.degree.-135.degree. C.;
- 1-25% plasticizing oil;
- and 0.5-3% antioxidant;
- wherein the improvement comprises the presence of 3-15% of a polymeric fatty acid polyamide.
A hot-melt adhesive composition with improved heat resistance comprising 33-55% of a poly(vinylarene)-polyisoprene-poly(vinylarene) copolymer;
- 25-45% of a terpene tackifying resin;
- and 10-30% of a hydrocarbon resin;
- wherein the improvement comprises the presence of 3-15% of a polymeric fatty acid polyamide.
A method of improving the heat resistance of hot melt adhesives containing A-B-A type rubbery copolymer, wherein the improvement comprises the step of adding thereto 1-20% of a polymeric fatty acid polyamide.
Dependencies are inferred from the claim text.