Thermoplastic fluoropolymer adhesive composition
AssigneeRaychem Corporation
InventorsAchilles Chiotis, Pravin Soni
Life of this patent
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Abstract
A thermoplastic fluoropolymer adhesive composition containing a thermoplastic fluoropolymer, an elastomeric fluoropolymer, a thermoplastic ethylene copolymer and a tackifier, in which the combined amount of ethylene copolymer and tackifier is less than about 30% by weight (based on the weight of the four components) and the ratio of ethylene copolymer is less than about 2:1, has improved sealing performance and flame resistance than similar compositions containing greater amounts of ethylene copolymer and tackifier. The composition is particularly useful for sealing surfaces of uncrosslinked ethylene-tetrafluoroethylene copolymers.
Claims14
An adhesive composition comprising:
- (a) about 40 to about 70% by weight of a thermoplastic fluoropolymer which is a thermoplastic copolymer of vinylidene fluoride and at least one other monomer;
- (b) about 5 to about 25% by weight of an elastomeric fluoropolymer;
- (c) about 5 to about 25% by weight of a thermoplastic ethylene copolymer comprising at least 50 mole % of units derived from ethylene and at least 5 mole % of units derived from at least one unsaturated comonomer containing at least one polar group;
- and
- (d) about 5 to about 20% by weight of a tackifier;
- with the proviso that the combined amounts of (c) and (d) are less than about 30% by weight and that the ratio of (c) to (d) is less than about 2:1, all percentages by weight being based on the total weight of the four components.
A heat-recoverable article having a coating on at least a portion of a surface thereof, an adhesive composition comprising:
- (a) about 40 to about 70% by weight of a thermoplastic fluoropolymer which is a thermoplastic copolymer of vinylidene fluoride and at least one other monomer;
- (b) about 5 to about 25% by weight of an elastomeric fluoropolymer;
- (c) about 5 to about 25% by weight of a thermoplastic ethylene copolymer comprising at least 50 mole % of units derived from ethylene and at least 5 mole % of units derived from at least one unsaturated comonomer containing at least one polar group;
- and
- (d) about 5 to about 20% by weight of a tackifier;
- with the proviso that the combined amounts of (c) and (d) are less than about 30% by weight and that the ratio of (c) to (d) is less than about 2:1, all percentages by weight being based on the total weight of the four components.
Dependencies are inferred from the claim text.