US 5,371,153 A · Polyamide fibers

Abstract

The present process for producing aromatic polyamide fibers for reinforcement of rubbers lies in that, in the first step, the fibers are dipped in an epoxy treating solution containing aromatic glycidylamines having 2 or more epoxy groups in one molecule and aromatic amines at a specific ratio and dried and cured, and thereafter, in the second step, the fibers are dipped in a treating solution for the second step containing resorcin formaldehyde resins and rubber latices and dried and cured. More preferably, specific chlorophenol compounds are added to the treating solution for the second step. The aromatic polyamide fibers obtained by the process of the present invention provide rubber products excellent in water resistance when they are used for reinforcement of rubbers, and the products have high adhesive strength in initial adhesion and besides, small decrease in adhesive strength even if they are dipped in water for a long time.

Claims14

Dependent claims

A process for producing aromatic polyamide fibers for reinforcement of rubber comprising:

(a) dipping aromatic polyamide fiber in an epoxy treating dispersion and then drying and curing the dipped aromatic polyamide fiber, said epoxy treating dispersion having 0.1-30% by weight of at least one aromatic epoxy compound having two or more epoxy groups in one molecule, and 1-100 parts by weight of at least one aromatic amine, based on 100 parts by weight of the aromatic epoxy compounds, in water, wherein said epoxy treating dispersion is stabilized with a stabilizing amount of a surfactant, an organic solvent or both;
and
(b) dipping the aromatic polyamide fiber from (a) in a treating solution containing resorcin-formaldehyde resins and rubber latices and then drying and curing the second treated aromatic polyamide fiber.

A process for producing aromatic polyamide fibers for reinforcement of rubber comprising:

(a) dipping aromatic polyamide fiber in an aqueous dispersion which consists essentially of 0.1-30% by weight of at least one aromatic epoxy compound selected from the group consisting of tetraglycidyldiaminodiphenylmethane, triglycidyl-p-aminophenol, triglycidyl-m-aminophenol, triglycidyl-4-amino-m-cresol, diglycidylaniline, diglycidyltoluidine, tetraglycidyl-m-xylylenediamine and diglycidyltribromoaniline, and 1-100 parts by weight of at least one aromatic amine, based on 100 parts by weight of the aromatic epoxy compound, selected from the group consisting of 3,4'-diaminodiphenyl ether, 4,4'-diaminodiphenyl sulfone, p,p'-diaminodinodiphenylmethane, m-phenylenediamine, m-toluylenediamine, o-toluylenediamine, xylylenediamine, 4-chloro-o-phenylenediamine, 3,'-diethyl-4,4'-diamino-diphenylmethane, m-aminobenzylamine, diaminopyridine and m-aminophenol, in water, wherein said aqueous dispersion is stabilized with a stabilizing effective amount of a surfactant, an organic solvent, or both, and drying and curing the dipped aromatic polyamide fiber;
and
(b) dipping the aromatic polyamide fiber from (a) in a treating solution which consists essentially of resorcin-formaldehyde resins, rubber latices and compounds represented by the following formula (1):
##STR7## wherein X each represents a hydrogen atom, a chlorine atom, a bromine atom, an alkyl group of 1-8 carbon atoms, an aryl group or an aralkyl group, --OH, --SH, --NH2, --NO2, --COOH, --CH2OH or ##STR8## Y represents a hydrogen atom, --OH, a chlorine atom or a bromine atom, Z represents ##STR9## m represents an integer of 0-2, n represents an integer of 1-10,
R.sub.1 and R.sub.2 each represents a hydrogen atom, an alkyl group of 1-8 carbon atoms, an aryl group or an aralkyl group, and
R.sub.3 and R.sub.4 each represents a hydrogen atom or an alkyl group of 1-8 carbon atoms, and drying and curing the treated aromatic polyamide fiber.

3 more elements

Dependencies are inferred from the claim text.

Polyamide fibers

Life of this patent

Polyamide fibers

Life of this patent

Abstract

Claims14