Tacky blend of butadiene-acrylonitrile copolymer thermosettable material having acrylate and epoxy groups peroxide and epoxy curing agent

Claim 2

A NORMALLY TACKY, HEAT-HARDENABLE, SUBSTANTIALLY SOLVENTFREE, COLD FLOW-RESISTANT, COHERENT ADHESIVE WHICH ESSENTIALLY COMPRISES A STORABLE UNIFORM BLEND OF POLYMERS WHICH ARE MUTUALLY SOLUBLE AT 95*C., SAID BLEND COMPRISING A PHYSICAL MIXTURE OF 1. 100 PARTS BY WEIGHT OF A THERMOSETTABLE RESIN SYSTEM CONTAINING BOTH ACRYLIC-TYPE UNSATURATION AND EPOXY GROUPS, ONE COMPONENT OF WHICH IS A POURABLE LIQUID AT 95*C. HAVING THE FORMULA

Claim 3

An adhesive according to claim 1 wherein the component containing the acrylic-type unsaturation is a reaction product of an epoxy resin of 4,4''-isopropylidenediphenol with methacrylic acid.

Claim 4

from about 25 to 250 parts by weight of an elastomeric butadiene:acrylonitrile copolymer and

Claim 5

from about 25 to 250 parts by weight of an elastomeric butadiene:acrylonitrile copolymer and

Claim 6

FROM ABOUT 25 TO 250 PARTS BY WEIGHT OF AN ELASTOMERIC BUTADIENE-ACRYLONITRILE COPOLYMER AND

Claim 7

FROM ABOUT 25 TO 250 PARTS BY WEIGHT OF AN ELASTOMERIC BUTADIENE-ACRYLONITRILE COPOLYMER AND

Claim 8

AN EFFECTIVE AMOUNT OF A DUAL CURING SYSTEM WHICH IS SUBSTANTIALLY INACTIVE AT ROOM TEMPERATURE AND WHICH CONTAINS ABOUT 1-5 PERCENT, BASED ON THE TOTAL WEIGHT OF THE BLEND, OF A PEROXIDE CURING AGENT FOR THE UNSATURATED GROUPS AND AT LEAST A STOICHIOMETRIC AMOUNT OF AN EPOXY GROUP CURING AGENT, SAID CONSTITUENTS BEING PRESENT IN AMOUNTS SUCH AS TO RENDER SAID BLEND WHEN FORMED PER SE IN A 75 MICRON LAYER, TACKY, FLEXIBLE AND SELF-SUSTAINING POSSESED OF AN INTERNAL STRENGTH VALUE OF AT LEAST ABOUT 5 MINUTES, RETENTIVE OF AN AFFINITY FOR THE SURFACE OF A SMOOTH ORIENTED POLYESTER FILM EQUAL TO AT LEAST ABOUT 225 GRAMS PER 1.25 CENTIMETERS OF WIDTH, WHEN MEASURED AFTER STORAAGE AT 50*C. FOR ONE YEAR, AND CAPABLE OF DISPLAYING A TENSILE SHEAR VALUE OF AT LEAST 70 KILOGRAMS PER SQUARE CENTIMETER AFTER CURE.

Claim 9

AN EFFECTIVE AMOUNT OF A DUAL CURING SYSTEM WHICH IS SUBSTANTIALLY INACTIVE AT ROOM TEMPERATURE AND WHICH CONTAINS ABOUT 1-5 PERCENT, BASED ON THE TOTAL WEIGHT OF THE BLEND, OF A PEROXIDE CURING AGENT FOR THE UNSATURATED GROUPS AND AT LEAST A STOICHIOMETRIC AMOUNT OF AN EPOXY GROUP CURING AGENT, SAID CONSTITUENTS BEING PRESENT IN AMOUNTS SUCH AS TO RENDER SAID BLEND WHEN FORMED PER SE IN A 75 MICRON LAYER, TACKY, FLEXIBLE AND SELF-SUSTAINING POSSESED OF AN INTERNAL STRENGTH VALUE OF AT LEAST ABOUT 5 MINUTES, RETENTIVE OF AN AFFINITY FOR THE SURFACE OF A SMOOTH ORIENTED POLYESTER FILM EQUAL TO AT LEAST ABOUT 225 GRAMS PER 1.25 CENTIMETERS OF WIDTH, WHEN MEASURED AFTER STORAAGE AT 50*C. FOR ONE YEAR, AND CAPABLE OF DISPLAYING A TENSILE SHEAR VALUE OF AT LEAST 70 KILOGRAMS PER SQUARE CENTIMETER AFTER CURE.

Claim 10

an effective amount of a dual curing system which is substantially inactive at room temperature and which contains about 1-5 percent, based on the total weight of the blend, of a peroxide curing agent for the unsaturated groups and at least a stoichiometric amount of an epoxy group curing agent, said constituents being present in amounts such as to render said blend when formed per se in a 75 micron layer, tacky, flexible and self-sustaining, possessed of an internal strength value of at least about 5 minutes, retentivE of an affinity for the surface of a smooth oriented polyester film equal to at least about 225 grams per 1.25 centimeters of width, when measured after storage at 50* C. for one year, and capable of displaying a tensile shear value of at least 70 kilograms per square centimeter after cure.

Claim 11

an effective amount of a dual curing system which is substantially inactive at room temperature and which contains about 1-5 percent, based on the total weight of the blend, of a peroxide curing agent for the unsaturated groups and at least a stoichiometric amount of an epoxy group curing agent, said constituents being present in amounts such as to render said blend when formed per se in a 75 micron layer, tacky, flexible and self-sustaining, possessed of an internal strength value of at least about 5 minutes, retentivE of an affinity for the surface of a smooth oriented polyester film equal to at least about 225 grams per 1.25 centimeters of width, when measured after storage at 50* C. for one year, and capable of displaying a tensile shear value of at least 70 kilograms per square centimeter after cure.

Claim 12

An adhesive according to claim 2 wherein the component containing the acrylic-type unsaturation is the reaction product of about 1 mole of the diglycidyl ether of 4,4''-isopropylidenediphenol with about 2 moles of methacrylic acid wherein substantially all of the oxirane groups have reacted.

Claim 13

An adhesive according to claim 2 wherein the component containing the acrylic-type unsaturation is the reaction product of about 1 mole of the diglycidyl ether of 4,4''-isopropylidenediphenol with about 1 mole of methacrylic acid wherein substantially one-half of the oxirane groups have reacted.

Claim 14

An adhesive according to claim 1 wherein the dual curing system is a combination of a peroxide and fumaric acid.

Claim 15

An adhesive according to claim 5 wherein the peroxide is tert-butyl peroctoate.

Claim 16

An adhesive according to claim 1 wherein the component containing the acrylic-type unsaturation is a reaction product of an epoxy resin of 4,4''-isopropylidenediphenol with acrylic acid.