Method of bonding using urethane base pressure sensitive adhesives

Claim 2

A process for making a urethane base pressure sensitive adhesive composition which comprises reacting an isocyanate-reactive component having isocyanate-reactive functionality and which includes a liquid diene telechelic polymer material having an average of at least about 1.6 essentially terminal, isocyanate-reactive functional groups per polymer molecule, each of said essentially terminal functional groups being attached to one of the last three carbon atoms at an end of the polymer molecule with a coreactive component having isocyanate functionality and which includes an organic polyisocyanate material capable of coreacting with said isocyanate-rEactive functional groups of said diene telechelic polymer material, said polyisocyanate material having an average number of isocyanate functional groups greater than one, said isocyanate functional groups being reactive with the isocyanate-reactive functional groups of the diene telechelic polymer material to increase the average molecular weight and modify the molecular structure of the diene telechelic polymer material, the ratio of isocyanate functional groups to isocyanatereactive functional groups being in the range from about .75 to 1 to about 1.2 to 1, in the presence of a tackifying resin material, to form an elastomer base material in the presence of said tackifying resin material, said tackifying resin material being present in the amount of at least about 75 parts by weight of tackifying resin material per 100 parts by weight of said elastomer base material, said tackifying resin material being sufficiently compatible with said elastomer base material that said tackifying resin material is soluble in said reactive component at 25*C, so that said tackifying resin renders said elastomer base material tacky, and wherein the step of reacting said isocyanate-reactive component with said coreactive component in the presence of said tackifying resin material comprises, mixing said isocyanate-reactive component with said coreactive component in the presence of said tackifying resin material to form a mixture, applying said mixture to a substrate, and curing said mixture in situ on said substrate.

Claim 3

A PROCESS FOR MAKING A URETHANE BASE PRESSURE SENSITIVE ADHESIVE COMPOSITION WHICH COMPRISES REACTING AN ISOCYANATE-REACTIVE COMPONENT HAVING ISOCYANATEREACTIVE FUNCTIONALITY AND WHICH INCLUDES A LIQUID DIENE TELECHELIC POLYMER MATERIAL HAVING AN AVERAGE OF AT LEAST ABOUT 1.6 ESSENTIALLY TERMINAL, ISOCYANATEREACTIVE FUNCTIONAL GROUPS PER POLYMER MOLECULE, EACH OF SAID ESSENTIALLY TERMINAL FUNCTIONAL GROUPS BEING ATACHED TO ONE OF THE LAST THREE CARBON ATOMS AT AN END OF THE POLYMER MOLECULE WITH A COREACTIVE COMPONENT HAVING ISOCYANATE FUNCTIONALITY AND WHICH INCLUDES AN ORGANIC POLYISOCYANATE MATERIAL CAPABLE OF COREACTING WITH SAID ISOCYANATE-REACTIVE FUNCTIONAL GROUPS OF SAID DIENE TELECHILIC POLYMER MATERIAL, SAID POLYISOCYANATE MATERIAL HAVING AN AVERAGE NUMBER OF ISOCYANATE FUNCTIONAL GROUPS BEING REACTIVE WITH THE SAID ISOCYANATE FUNCTIONAL GROUPS BEING REACTIVE WITH THE ISOCYANATE-REACTIVE FUNCTIONAL GROUPS OF THE DIENE TELECHELIC POLYMER MATERIAL TO INCREASE THE ABERAGE MOLECULAR WEIGHT AND MODIFY THE MOLECULAR STRUCTURE OF THE DIENE TELECHELIC POLYMER MATERIAL, THE RATIO OF ISOCYANATE FUNCTIONAL GROUPS TO ISOCYANATEREACTIVE FUNCTIONAL GROUPS BEING IN THE RANGE FROM ABOUT .75 TO 1 TO ABOUT 1.2 TO 1, IN THE PRESENCE OF A TACKIFYING RESIN MATERIAL, TO FORM AN ELASTOMER BASE MATERIAL IN THE PRESENCE OF SAID TACKIFYING RESIN MATERIAL, SAID TACKIFYING RESIN MATERIAL BEING PRESENT IN THE AMOUNT OF AT LEAST ABOUT 75 PARTS BY WEIGHT OF TACKIFYING RESIN MATERIAL PER 100 PARTS BY WEIGHT OF SAID ELASTOMER BASE MATERIAL, SAID TACKIFYING RESIN MATERIAL BEING SUFFICIENTLY COMPATIBLE WITH SAID ELASTOMER BASE MATERIAL THAT SAID TACKIFYING RESIN MATERIAL IS SOLUBLE IN SAID REACTIVE COMPONENT AT 25*C, SO THAT SAID TACKIFYING RESIN RENDERS SAID ELASTOMER BASE MATERIAL TACKY AND WHEREIN THE STEP OF REACTING SAID ISOCYANATE-REACTIVE COMPONENT WITH SAID COREACTIVE COMPONENT IN THE PRESENCE OF SAID TACKIFYING RESIN MATERIAL COMPRISES, MIXING SAID ISOCYANATE-REACTIVE COMPONENT WITH SAID COREACTIVE COMPONENT IN THE PRESENCE OF SAID TACKIFYING RESIN MATERIAL TO FORM A MIXTURE, APPLYING SAID MIXTURE TO A SUBSTRATE, AND CURING SAID MIXTURE IN SITU ON SAID SUBSTRATE.

Claim 4

A PROCESS FOR MAKING A URETHANE BASE PRESSURE SENSITIVE ADHESIVE COMPOSITION WHICH COMPRISES REACTING AN ISOCYANATE-REACTIVE COMPONENT HAVING ISOCYANATEREACTIVE FUNCTIONALITY AND WHICH INCLUDES A LIQUID DIENE TELECHELIC POLYMER MATERIAL HAVING AN AVERAGE OF AT LEAST ABOUT 1.6 ESSENTIALLY TERMINAL, ISOCYANATEREACTIVE FUNCTIONAL GROUPS PER POLYMER MOLECULE, EACH OF SAID ESSENTIALLY TERMINAL FUNCTIONAL GROUPS BEING ATACHED TO ONE OF THE LAST THREE CARBON ATOMS AT AN END OF THE POLYMER MOLECULE WITH A COREACTIVE COMPONENT HAVING ISOCYANATE FUNCTIONALITY AND WHICH INCLUDES AN ORGANIC POLYISOCYANATE MATERIAL CAPABLE OF COREACTING WITH SAID ISOCYANATE-REACTIVE FUNCTIONAL GROUPS OF SAID DIENE TELECHILIC POLYMER MATERIAL, SAID POLYISOCYANATE MATERIAL HAVING AN AVERAGE NUMBER OF ISOCYANATE FUNCTIONAL GROUPS BEING REACTIVE WITH THE SAID ISOCYANATE FUNCTIONAL GROUPS BEING REACTIVE WITH THE ISOCYANATE-REACTIVE FUNCTIONAL GROUPS OF THE DIENE TELECHELIC POLYMER MATERIAL TO INCREASE THE ABERAGE MOLECULAR WEIGHT AND MODIFY THE MOLECULAR STRUCTURE OF THE DIENE TELECHELIC POLYMER MATERIAL, THE RATIO OF ISOCYANATE FUNCTIONAL GROUPS TO ISOCYANATEREACTIVE FUNCTIONAL GROUPS BEING IN THE RANGE FROM ABOUT .75 TO 1 TO ABOUT 1.2 TO 1, IN THE PRESENCE OF A TACKIFYING RESIN MATERIAL, TO FORM AN ELASTOMER BASE MATERIAL IN THE PRESENCE OF SAID TACKIFYING RESIN MATERIAL, SAID TACKIFYING RESIN MATERIAL BEING PRESENT IN THE AMOUNT OF AT LEAST ABOUT 75 PARTS BY WEIGHT OF TACKIFYING RESIN MATERIAL PER 100 PARTS BY WEIGHT OF SAID ELASTOMER BASE MATERIAL, SAID TACKIFYING RESIN MATERIAL BEING SUFFICIENTLY COMPATIBLE WITH SAID ELASTOMER BASE MATERIAL THAT SAID TACKIFYING RESIN MATERIAL IS SOLUBLE IN SAID REACTIVE COMPONENT AT 25*C, SO THAT SAID TACKIFYING RESIN RENDERS SAID ELASTOMER BASE MATERIAL TACKY AND WHEREIN THE STEP OF REACTING SAID ISOCYANATE-REACTIVE COMPONENT WITH SAID COREACTIVE COMPONENT IN THE PRESENCE OF SAID TACKIFYING RESIN MATERIAL COMPRISES, MIXING SAID ISOCYANATE-REACTIVE COMPONENT WITH SAID COREACTIVE COMPONENT IN THE PRESENCE OF SAID TACKIFYING RESIN MATERIAL TO FORM A MIXTURE, APPLYING SAID MIXTURE TO A SUBSTRATE, AND CURING SAID MIXTURE IN SITU ON SAID SUBSTRATE.

Claim 5

A process in accordance with claim 1, wherein said mixture includes a plasticizer material.

Claim 6

A process in accordance with claim 1, wherein said mixture includes a high molecular weight; polymeric, solidification agent which is a solid elastomeric polymer which is capable of reversible elongation, and said solidification agent being present in an amount up to about 90 parts by weight per 100 parts by weight of said elastomer base material.

Claim 7

A process in accordance with claim 1, wherein said mixture prior to application to said substrate includes a solvent.

Claim 8

A process in accordance with claim 4, wherein said solvent is removed prior to completion of curing in situ.

Claim 9

A process in accordance with claim 1, wherein said mixture includes a catalyst for catalyzing the in situ curing of said mixture.

Claim 10

A process in accordance with claim 1, wherein the ingredients of said isocyanate-reactive component are pre-mixed together to form an isocyanate-reactive component mixture, then said isocyanate-reactive component mixture is mixed with said coreactive component in the presence of said tackifying resin material.

Claim 11

A process in accordance with claim 7, wherein the tackifying resin material and the ingredients of said isocyanate-reactive component are pre-mixed together to form said isocyanate-reactive component mixture.

Claim 12

A process in accordance with claim 1, wherein said substrate is stored subsequent to completion of curing in situ.

Claim 13

A process in accordance with claim 1, wherein the step of curing said mixture in situ comprises heating said mixture on said substrate, then storing said substrate.

Claim 14

A process in accordance with claim 10, wherein said storing occurs at an elevated temperature.

Claim 15

A process in accordance with claim 10, wherein said storing occurs at ambient temperature.

Claim 16

A process in accordance with claim 1, wherein said mixture prior to application to said substrate includes a solution of a high molecular weight, polymeric solidification agent in a solvent, said solidification agent being a solid elastomeric polymer which is capable of reversible elongation.

Claim 17

A process in accordance with claim 1, wherein said substrate comprises a release paper, and subsequent to application of said mixture to said reLease paper, said paper is laminated to an end-product substrate web with said mixture disposed between said release paper and said web.

Claim 18

A process in accordance with claim 14, wherein said release paper is laminated to said web prior to completion of said curing in situ.