Moisture-curable melt-processible ethylene copolymer adhesives
AssigneeE. I. Du Pont de Nemours and Company
InventorGeorge W. Prejean
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Abstract
Moisture-curable melt-processible adhesives are obtained by reacting certain ethylene copolymers containing an n-alkyl acrylate and a carefully limited amount of a carboxylic acid with a stoichiometric amount of an epoxy-silane. A process of preparing the moisture-curable melt-processible adhesives in the absence of solvent is also available.
Claims9
A melt-processible moisture-curable copolymer comprising the reaction product of
- (A) a direct copolymer from monomers comprising
- (i) ethylene,
- (ii) 1-5 wt. % of the direct copolymer of an alpha,beta-ethylenically unsaturated carboxylic acid selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, half esters of maleic acid and itaconic acid, and
- (iii) 20-40 wt. % of the direct copolymer of a n-alkyl acrylate or methacrylate wherein the n-alkyl group contains 4-8 carbon atoms, and
- (B) a substantially stoichiometric amount with respect to the amount of carboxylic acid, of an epoxy-silane, wherein the melt index of the melt-processible, moisture-curable copolymer is from 30 to 1500.
The process of preparing a moisture-curable melt-processible copolymer comprising mixing in melt mixing equipment, in the absence of solvent, at a temperature of from 140.degree.to 200.degree. C.,
- (A) a direct copolymer from monomers comprising
- (i) ethylene,
- (ii) 1-5 wt. % of the direct copolymer of an alpha,beta-ethylenically unsaturated carboxylic acid selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, half esters of maleic acid and itaconic acid, and
- (iii) 20-40 wt. % of the direct copolymer of a C4-C8 n-alkyl acrylate or methacrylate, and
- (B) a substantially stoichiometric amount with respect to the amount of carboxylic acid, of an epoxy-silane, wherein the melt index of the resultant melt-processible, moisture-curable copolymer is from 30 to 1500.
Dependencies are inferred from the claim text.