Polyamide graft as hot-melt adhesive, and elastomer blend
AssigneeRaychem Corporation
InventorsGeorge B. Park, John M. Senior
Life of this patent
Estimating the term…
Abstract
A polyamide suitable as a hot-melt adhesive contains pendent graft copolymerized chains derived from aromatic compounds having an olefinically unsaturated moiety, e.g., styrene, lower methacrylates, epoxy-containing unsaturated compounds, acrylonitrile or methacrylonitrile, but contains no free graft comonomer. The polyamides show improved peel strengths, especially at low and high temperatures. The low temperature properties may be further improved by incorporating an elastomer, preferably a thermoplastic elastomer, part of which is compatible with the graft copolymerized chains.
Claims27
A polyamide suitable for use as a hot-melt adhesive, the polyamide being formed from at least one dicarboxylic acid and at least one polyamine, wherein there is an average of at least fifteen carbon atoms separating the acid or the amine groups of at least one of said dicarboxylic acid or said polyamine, respectively, and containing pendent graft copolymerized chains derived from at least one graft comonomer selected from the group consisting of aromatic compounds having at least one olefinically unsaturated moiety, lower methacrylate esters, acrylonitrile and methacrylonitrile, the polyamide containing substantially no free graft comonomer.
A polyamide suitable for use as a hot-melt adhesive, the polyamide being formed from at least one dicarboxylic acid and at least one polyamine, wherein there is an average of at least fifteen carbon atoms separating the acid or the amine groups of at least one of said dicarboxylic acid or said polyamine, respectively, and containing pendant graft copolymerised chains derived from at least one graft comonomer selected from the group consisting of styrene, substituted styrenes, lower methacrylate esters, acrylonitrile and methacrylonitrile, and containing substantially no free graft comonomer.
A process for the production of a grafted polyamide which comprises forming free radical sites in an ungrafted polyamide that is suitable for use as a hot-melt adhesive, said polyamide being formed from at least one dicarboxylic acid and at least one polyamine wherein there is an average of at least fifteen carbon atoms separating the acid or the amine groups of at least one of said dicarboxylic acid or said polyamine, respectively, and allowing one or more graft comonomers comprising an aromatic compound having at least one olefinically unsaturated moiety, a lower methacrylate ester, acrylonitrile or methacrylonitrile, to polymerise on the free radical sites, and, if necessary, then removing unreacted graft comonomer from the polyamide.
A dimensionally heat-recoverable article at least part of which has been coated with a hot-melt adhesive composition comprising a polyamide formed from at least one dicarboxylic acid and at least one polyamine, wherein there is an average of at least fifteen carbon atoms separating the acid or the amine groups of at least one of said dicarboxylic acid or said polyamine, respectively, and containing pendent graft copolymerized chains derived from at least one graft comonomer selected from the group consisting of aromatic compounds having at least one olefinically unsaturated moiety, lower methacrylate esters, acrylonitrile and methacrylonitrile, the polyamide containing substantially no free graft comonomer.
A dimensionally heat-recoverable article at least part of which has been coated with a hot-melt adhesive composition comprising a polyamide being formed from at least one dicarboxylic acid and at least one polyamine, wherein there is an average of at least fifteen carbon atoms separating the acid or the amine groups of at least one of said dicarboxylic acid or said polyamine, respectively, and containing pendant graft copolymerised chains derived from at least one graft comonomer selected from the group consisting of styrene, substituted styrenes, lower methacrylate esters, acrylonitrile and methacrylonitrile, and containing substantially no free graft comonomer.
Dependencies are inferred from the claim text.