Polyurethane elastomeric composition and method of preparing the same

Patent metadata

Field	Value
Publication number	US-10450470-B2
Application number	US-201415038763-A
Country	US
Kind code	B2
Filing date	Nov 25, 2014
Priority date	Nov 26, 2013
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

A polyurethane elastomeric composition includes the reaction product of an isocyanate component and an isocyanate-reactive component. The isocyanate-reactive component includes a polydiene polyol present in the isocyanate-reactive component in an amount of greater than 0 and less than about 95 parts by weight based on 100 parts by weight of the isocyanate-reactive component. The polydiene polyol has an average hydroxy functionality of no greater than about 3 and a number average molecular weight of from about 1000 to less than about 2000 g/mol.

First claim

What is claimed is:

1. A flexible polyurethane elastomeric composition for coating a substrate, said composition comprising the reaction product consisting of:
(A) an isocyanate component comprising diphenylmethane diisocyanate (MDI) and/or polymeric MDI in an amount of 48.05 to 55.98 parts by weight based on 100 parts by weight of an isocyanate-reactive component; and
(B) the isocyanate-reactive component consisting of
a polydiene polyol present in the isocyanate-reactive component in an amount of 9.88 to 92.00 parts by weight based on 100 parts by weight of said isocyanate-reactive component and having an average hydroxy functionality of no greater than about 3 and a number average molecular weight of from about 1000 to less than about 2000 g/mol, wherein the polydiene polyol comprises about 20 percent by weight 1,2-vinyl units based on the total weight of the polydiene polyol and has a viscosity of about 0.9 to 1.9 Pa·s;
a chain extender present in the isocyanate-reactive component in an amount of 8.00 to 17.00 parts by weight based on 100 parts by weight of said isocyanate-reactive component and having at least two hydroxyl groups and a molecular weight of from about 62 to about 220; and
optionally, a polyether polyol, a catalyst, an antifoaming agent, and a molecular sieve.

2. The polyurethane elastomeric composition of claim 1 , wherein the polydiene polyol is a polybutadiene polyol.

3. The polyurethane elastomeric composition of claim 1 , wherein the polyether polyol and the polydiene polyol together have an average hydroxy functionality of no greater than about 3.

4. The polyurethane elastomeric composition of claim 3 , wherein the polyether polyol has a nominal hydroxyl functionality of from about 2 to about 4, a hydroxyl number of from about 20 to about 1000 mg KOH/g, and a number average molecular weight of from about 400 to about 15,000 g/mol.

5. The polyurethane elastomeric composition of claim 1 , wherein the average hydroxy functionality is no greater than about 2.

6. The polyurethane elastomeric composition of claim 1 , wherein the chain extender comprises an alkylene glycol.

7. The polyurethane elastomeric composition of claim 1 , wherein polydiene polyol present in the isocyanate-reactive component in an amount of from 60 to 90 parts by weight based on 100 parts by weight of the isocyanate-reactive component.

8. A subsea structure at least partially coated with the polyurethane elastomeric composition of claim 1 .

9. The subsea structure of claim 8 , wherein the subsea structure is a pipe, a flowline, a manifold, a riser, a field joint, a bend restrictor, a bend stiffener, a joint, a jumper, a pipeline end terminator, a pipeline end manifold, or a Christmas tree.

10. A method comprising:
applying the polyurethane elastomeric composition of claim 1 , to a subsea structure.

11. The method of claim 10 , wherein applying the polyurethane elastomeric composition comprises simultaneously spraying the isocyanate component and the isocyanate-reactive component onto the subsea structure.

12. The method of claim 10 , further comprising immersing the subsea structure into a fluid, wherein the subsea structure is insulated from the fluid by the polyurethane elastomeric composition.

13. A method of forming the flexible polyurethane elastomeric composition according to claim 1 on a substrate, said method comprising:
(A) providing said substrate;
(B) providing said isocyanate component;
(C) providing said isocyanate-reactive component;
(D) reacting the isocyanate component and the isocyanate-reactive component together to form a reaction mixture; and
(E) applying said reaction mixture to said substrate and forming the polyurethane elastomeric composition on said substrate.

14. The method of claim 13 , wherein reacting the isocyanate component and the isocyanate-reactive component together comprises heating the isocyanate component and the isocyanate-reactive component.

15. The method of claim 13 , wherein the polydiene polyol is a polybutadiene polyol.

16. The method of claim 13 , wherein the polyether polyol and the polydiene polyol together have an average hydroxy functionality of no greater than about 3.

17. The method of claim 16 , wherein the polyether polyol has a nominal hydroxy functionality of from about 2 to about 4, a hydroxyl number of from about 20 to about 1000 mg KOH/g, and a number average molecular weight of from about 400 to about 15,000 g/mol.

18. The method of claim 13 , wherein the average hydroxy functionality is no greater than about 2.

Assignees

• Basf Se

Inventors

• Jones Jr Charles E
• Gust Karl R

Classifications

• C08G18/6588 Primary

  with compounds of group C08G18/3203 · CPC title

• C08G18/69

  Polymers of conjugated dienes {(hydrogenated polymers of conjugated dienes C08G18/6208)} · CPC title

• C08G18/698

  Mixtures with compounds of group C08G18/40 · CPC title

• C08G18/6674

  with compounds of group C08G18/3203 · CPC title

• C08G18/4825

  Polyethers containing two hydroxy groups (C08G18/4833 - C08G18/5096 take precedence) · CPC title