Claims
- 1. Laminate comprising at least one permeable membrane layer and at least one nylon fabric layer wherein said laminate is bordered with an adhesive comprising a polyurethane consisting essentially of two separate components, A and B wherein,
- Component A comprises a polyol having at least about 95 mol % C.sub.2 H.sub.5 C(R).sub.3 and about 0-5 mol % C.sub.2 H.sub.5 C(R')(R.sub.2), wherein R is --CH.sub.2 --O--CH.sub.2 CH.sub.2 OH and R' is --CH.sub.2 O--CH.sub.2 --O--CH.sub.2 CH.sub.2 --OH; and
- Component B comprises a polyisocyanate prepolymer,
- R"--CH.sub.2 CH.sub.2 [O--C(:O)(CH.sub.2).sub.4 C(:O)--O--CH.sub.2 CH.sub.2 ].sub.n --R", wherein R" is ##STR3## n is about 2-4; and the weight ratio of A:B being about 1:2-7.
- 2. Laminate according to claim 1 wherein Component A additionally includes trialkyl citrate wherein said trialkyl has one to five carbons and A has a citrate:polyol weight ratio of about 1:2-3; and Component B additionally includes a polyisocyanate mixture consisting essentially of about 60%-70% by weight Component (i) and about 30%-40% by weight Component (ii), wherein
- (i) comprises a mixture of about 88% by weight of 4,4'-diphenylmethane diisocyanate and about 12% 2,4'-diphenylmethane diisocyanate; and
- (ii) is a polymer of the formula, ##STR4## having a functionality of 2.3, wherein n is a variable between 1 and 8.
- 3. Laminate according to claim 2 wherein in parts by weight Component A consists essentially of 25.6 parts polyol and 10.6 parts triethyl citrate; and Component B consists essentially of 100 parts of said polyisocyanate prepolymer and 15 parts of said polyisocyanate mixture of (i) and (ii).
- 4. Laminate according to claim 2 wherein Component A additionally includes a thixotropic additive, the weight ratio of said additive to the combined weights of polyol and trialkyl citrate being about 1:10-100.
- 5. Laminate according to claim 4 wherein said thixotropic additive is diethyl toluene diamine.
- 6. Process of making a gas permeation module comprising
- (a) forming a laminate from at least one permeable membrane layer and at least one nylon fabric layer wherein said laminate is bordered with an adhesive,
- (b) adhering at least one laminate from (a) to a spacer element to form a gas permeation laminate,
- (c) wrapping said gas permeation laminate around a supporting core,
- (d) placing said wrapped core into a cylinder casing to form said permeation module
- wherein the adhesive in (a) comprises a polyurethane consisting essentially of two separate components, A and B wherein,
- A comprises a polyol comprising at least about 95 mol % C.sub.2 H.sub.5 C(R).sub.3 and about 0-5 mol % C.sub.2 H.sub.5 C(R')(R).sub.2, wherein R is --CH.sub.2 --O--CH.sub.2 CH.sub.2 OH and R' is --CH.sub.2 O--CH.sub.2 --CH.sub.2 --O--CH.sub.2 CH.sub.2 --OH; and
- B comprises a polyisocyanate prepolymer, R" --CH.sub.2 CH.sub.2 [O--C(:O)(CH.sub.2).sub.4 C(:O)--O--CH.sub.2 CH.sub.2 ].sub.n --R", wherein R" is ##STR5## n is about 2-4; and the weight ratio of A:B being about 1:2-7.
- 7. Process according to claim 6 wherein Component A additionally includes trialkyl citrate wherein said trialkyl has one to five carbons and A has a citrate:polyol weight ratio of about 1:2-3; and Component B additionally includes a polyisocyanate mixture consisting essentially of about 60%-70% by weight Component (i) and about 30%-40% by weight Component (ii),
- wherein
- (i) comprises a mixture of about 88% by weight of 4,4'-diphenylmethane diisocyanate and about 12% 2,4'-diphenylmethane diisocyanate; and
- (ii) is a polymer of the formula, ##STR6## having a functionality of 2.3, wherein n is a variable between 1 and 8.
- 8. Process according to claim 7 wherein in parts by weight, Component A consists essentially of 25.6 parts polyol and 10.6 parts triethyl citrate; and Component B consists essentially of 100 parts of said polyisocyanate prepolymer and 15 parts of said polyisocyanate mixture of (i) and (ii).
- 9. Process according to claim 7, wherein Component A additionally includes a thixotropic additive, the weight ratio of said additive to the combined weights of said polyol and trialkyl citrate being about 1:10-100.
- 10. Process according to claim 9, wherein said thixotropic agent is diethyl toluene diamine.
- 11. A gas permeation module comprising a product from a process according to claim 6, 7, 8, 9 or 10.
Parent Case Info
This is a division of application Ser. No. 364,761, filed Jun. 12, 1989, now U.S. Pat. No. 5,041,517.
US Referenced Citations (21)
Divisions (1)
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Number |
Date |
Country |
Parent |
364761 |
Jun 1989 |
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