Impermeable, nonporous polyarylene sulfide laminate and process therefor

Claim 2

AN IMPERMEABLE LAMINATE STRUCTURE COMPRISING A MOLDED POROUS ARYLENE SULFIDE POLYMER COMPOSITION HAVING APPLIED TO THE SURFACE THEREOF A CROSS-LINKED NONPOROUS ARYLENE SULFIDE POLYMER COATING.

Claim 3

A laminate structure according to claim 1 wherein said porous arylene sulfide polymer molded composition additionally contains therein a particulate heat-resistant material.

Claim 4

A laminate structure according to claim 2 wherein said porous arylene sulfide polymer and said particulate heat-resistant material are present in an amount in the ratio of 0.1:1 to 10:1 of polymer to heat-resistant material.

Claim 5

A laminate structure according to claim 2 wherein said heat-resistant material is asbestos.

Claim 6

A laminate structure according to claim 1 wherein said porous arylene sulfide polymer is polyphenylene sulfide.

Claim 7

A laminate structure according to claim 1 wherein said non-porous arylene sulfide polymer is polYphenylene sulfide.

Claim 8

A LAMINATE STRUCTURE ACCORDING TO CLAIM 1 WHEREIN SAID LAMINATE IS IN THE FORM OF A CONDUIT.

Claim 9

A laminate according to claim 7 wherein said coating is on at least one surface of said conduit.

Claim 10

A PROCESS OF MAKING A LAMINATE STRUCTURE WHICH COMPRISES A. FORMING A SLURRY OF A POROUS ARYLENE SULFIDE POLYMER IN A VOLTALIZABLE LIQUID; B. COMPRESSING THE RESULTING SLURRY SO AS TO FORM A MOLDED ARTICLE CONTAINING THEREIN AT LEAST 0.1 WEIGHT PERCENT RESIDUAL VOLATIZABLE LIQUID; C. HEATING THE RESULTING MOLDED ARTICLE AT A FIRST TEMPERATURE SO AS TO SUBSTANTIALLY VOLATILIZE THE RESIDUAL LIQUID THEREIN; D. THEREAFTER, FURTHER HEATING THE RESULTING SUBSTANTIALLY LIQUID-FREE MOLDED ARTICLE AT A SECOND TEMPERATURE SO AS TO SUBSTANTIALLY CURE THE POLYMER; E. THEREAFTER APPLYING A CONTINUOUS LAYER OF A NONPOROUS ARYLENE SULFIDE POLYMER TO AT LEAST ONE SURFACE OF SAID MOLDED ARTICLE; F. THEREAFTER, FURTHER HEATING THE RESULTING COATED ARTICLE AT A THIRD TEMPERATURE SO AS TO SUBSTANTIALLY CURE THE COATING POLYMER; AND G. THEREAFTER RECOVERING THE RESULTING LAMINATE STRUCTURE CONTAINING POLY(ARYLENE SULFIDE) COMPOSITION AS A PRODUCT OF THE PROCESS.

Claim 11

A PROCESS OF MAKING A LAMINATE STRUCTURE WHICH COMPRISES A. FORMING A SLURRY OF A POROUS ARYLENE SULFIDE POLYMER IN A VOLTALIZABLE LIQUID; B. COMPRESSING THE RESULTING SLURRY SO AS TO FORM A MOLDED ARTICLE CONTAINING THEREIN AT LEAST 0.1 WEIGHT PERCENT RESIDUAL VOLATIZABLE LIQUID; C. HEATING THE RESULTING MOLDED ARTICLE AT A FIRST TEMPERATURE SO AS TO SUBSTANTIALLY VOLATILIZE THE RESIDUAL LIQUID THEREIN; D. THEREAFTER, FURTHER HEATING THE RESULTING SUBSTANTIALLY LIQUID-FREE MOLDED ARTICLE AT A SECOND TEMPERATURE SO AS TO SUBSTANTIALLY CURE THE POLYMER; E. THEREAFTER APPLYING A CONTINUOUS LAYER OF A NONPOROUS ARYLENE SULFIDE POLYMER TO AT LEAST ONE SURFACE OF SAID MOLDED ARTICLE; F. THEREAFTER, FURTHER HEATING THE RESULTING COATED ARTICLE AT A THIRD TEMPERATURE SO AS TO SUBSTANTIALLY CURE THE COATING POLYMER; AND G. THEREAFTER RECOVERING THE RESULTING LAMINATE STRUCTURE CONTAINING POLY(ARYLENE SULFIDE) COMPOSITION AS A PRODUCT OF THE PROCESS.

Claim 12

A process according to claim 9 wherein said porous arylene sulfide polymer has additionally combined therewith a particulate heat-resistant material.

Claim 13

A process according to claim 9 wherein the porous arylene sulfide polymer is polyphenylene sulfide.

Claim 14

A process according to claim 9 wherein the nonporous arylene sulfide polymer is polyphenylene sulfide.

Claim 15

A process according to claim 9 wherein the volatilizable liquid is water.

Claim 16

A process according to claim 10 wherein the heat-resistant filler composition is asbestos.

Claim 17

A process according to claim 9 wherein the porous molded article is coated by contacting said article with a arylene sulfide polymer in a fluidized bed.

Claim 18

A process according to claim 12 wherein the nonporous arylene sulfide polymer additionally contains therein 5 to 20 weight percent polytetrafluoroethylene.