Pregellable adhesives
AssigneeHenkel Kommanditgesellschaft auf Aktien (Henkel KGAA) Henkelstrasse 67
InventorsThierry Lanoye, Anne-Marie Garnault
Life of this patent
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Abstract
A pregellable adhesive containing several polymers, of which at least one is olefinically unsaturated and the other capable of curing by esterification, prepared in such a way that it cures by two different chemical reaction mechanisms which can be activated successively and catalyzed at least substantially independently of one another.
Claims13
A liquid or spreadable vulcanizable rubber mixture based on more than one polymer of which at least one polymer is olefinically unsaturated, wherein said mixture comprises
- (a) from about 30 to about 70 parts by weight of a polymer A containing on average at least two hydroxyl groups per macromolecule;
- (b) from about 70 to about 30 parts by weight of a polymer B compatible with A and containing on average at least two carboxylic acid and/or carboxylic anhydride groups or at least one carboxylic acid and one carboxylic anhydride group per molecule;
- (c) from about 10 to about 120 parts by weight of vulcanization auxiliary components;
- and, optionally,
- (d) from about 0.1 to about 5 parts by weight of an esterification catalyst;
- wherein at least one of polymers A and B is vulcanizable under vulcanization conditions at an elevated temperature through its olefinic double bonds, and wherein one of polymers A and B is derived from a vulcanizable polydiene and the other polymer is a compatible polyamide, polyester, or a copolymer containing OH and/or carboxylic acid or carboxylic anhydride groups, or wherein both polymers A and B are derived from polydienes or copolymers thereof.
A process for the formation of an adhesive bond between vulcanizable substrates comprising the steps of
- (a) forming a first rubber mixture comprising a polymer A containing on average at least two hydroxyl groups per macromolecule,
- (b) forming a second rubber mixture comprising a polymer B compatible with polymer A and containing on average at least two carboxylic acid and/or carboxylic anhydride groups or at least one carboxylic acid and one carboxylic anhydride group per molecule;
- and wherein at least one of polymer A and polymer B contains vulcanizable carbon-carbon double bonds;
- and wherein at least one esterification catalyst and at least one vulcanizing agent that regulates vulcanization through the reaction of the vulcanizable carbon-carbon double bonds are added to either or both of the first and second rubber mixtures,
- (c) mixing together said first and second rubber mixtures to form an adhesive;
- (d) applying said adhesive between two substrates to be bonded;
- (e) forming a precured adhesive by precuring said adhesive bond at a temperature of about from about 25° C. to about 170° C. but below the temperature at which vulcanizaion takes place;
- and
- (f) vulcanizing said precured adhesive by heating said precured adhesive to a vulcanization temperature of at least about 170° C.
A process for the formation of an adhesive bond between vulcanizable substrates comprising the steps of
- (a) forming a rubber mixture comprising a polymer A containing on average at least two hydroxyl groups per macromolecule, a polymer B compatible with polymer A and containing on average at least two carboxylic acid and/or carboxylic anhydride groups or at least one carboxylic acid and one carboxylic anhydride group per molecule, and wherein at least one of polymer A and polymer B contains vulcanizable carbon-carbon double bonds, at least one esterification catalyst, and at least one vulcanizing agent that regulates vulcanization through the reaction of vulcanizable carbon-carbon double bonds;
- (b) applying said adhesive between two substrates to be bonded;
- (c) forming a precured adhesive by precuring said adhesive bond at a temperature of about from about 25° C. to about 170° C. but below the temperature at which vulcanization takes place;
- and
- (d) vulcanizing said precured adhesive by heating said precured adhesive to a vulcanization temperature of at least about 170° C.
Dependencies are inferred from the claim text.