Claims
- 1. A stable liquid organic polyisocyanate fluid dispersion for use in preparing reaction injected molded polyurethane resins having improved mold release properties having dispersed therein from 1-15 percent by weight of a polysiloxane mold release agent which consists essentially of 0.5-20 mol percent of R.sub.a R'.sub.b SiO.sub.[4-(a+b)]/2 units and from 80-99.5 mol percent of R".sub.c SiO.sub.(4-c)/2 units where R is an isocyanate reactive organic radical, a has an average value of from 1-3, R' and R" are both non-isocyanate reactive organic radicals, b has an average value of 0-2, a+b is from 1-3, and c has an average value of from 1-3, wherein
- the ratio of the total molecular weight of said polysiloxane mold release agent to the total number of isocyanate reactive functional groups in said polysiloxane mold release agent ranges from 100-3500,
- the combined formula weights of all isocyanate reactive organic radicals, R do not exceed 40% of the total molecular weight of said polysiloxane mold release agent,
- the combined formula weights of all non-isocyanate reactive radicals, R'+R" together do not exceed 40% of the total molecular weight of said polysiloxane mold release additive,
- the combined formula weights of all the organic radicals R+R'+R" in the molecule together do not exceed 60% of the total molecular weight of the molecule,
- said polysiloxane mold release agent contains an average of at least two isocyanate reactive functional groups per molecule,
- at least two of the isocyanate reactive functional groups in each molecule are located on separate organic radicals, R, attached independently to different silicon atoms in said polysiloxane,
- said isocyanate reactive functional groups (R) are selected from the group consisting of alcohols, phenols, thiols, carboxylic acids, primary or secondary aromatic amines which contain no oxygen and which contain not more than one nitrogen atom attached directly to, in conjugation with, or incorporated within the aromatic ring nucleous, and secondary aliphatic amines wherein at least one of the alkyl carbon atoms bonded directly to the nitrogen atom is not a primary carbon atom,
- the molecular weight of said polysiloxane mold release agent ranges from 1000 and 30,000, and
- said polysiloxane mold release agent being substantially insoluble in said liquid polyisocyanate, and from 1-25 percent based on the weight of said polysiloxane mold release agent of a liquid silicone surfactant substantially free of isocyanate reactivity whereby said liquid remains substantially ungelled and fluid up to 25.degree. C.
- 2. A composition of claim 1 wherein said silicone surfactant has the general formula:
- (CH.sub.3).sub.3 Si[OSii(CH.sub.3).sub.2 ].sub.x [CH.sub.3 R+SiO].sub.4 [CH.sub.3 R*SiO].sub.z OSi(CH.sub.3).sub.3
- where the value of X, Y or Z vary from 10-1000 and R+ and R* may be the same or different and are radicals selected from the group consisting of an alkyl group, polyalkyl ether group, alkoxyether group, and grafted methoxy, ethoxy, ethylene, styrene, trifluoropropene, allyltetrahydrofurfurylether, allyloxyethyl acetate, acrolein diethylacetal, allylcyanide, allyloxyethyl cyanide, allylmorpholie, and allylchloride groups where the sum of the total formula weight for R+ and R* ranges from 800-40,000 and the polysiloxane block ranges from 15-70% of the molecular weight.
- 3. A composition of claim 1 wherein said surfactant has the general formula:
- Me.sub.3 SiO(Me.sub.2 SiO).sub.x [Z'O(CHMeCH.sub.2 O).sub.m (C.sub.2 H.sub.4 O).sub.n ZSi(Me)O].sub.4 SiMe.sub.3
- where Me=CH.sub.3 ; x is 42-125; y is 3-15; m is 15-30; n is 10-30; Z' is selected from the group consisting of alkyl, aryl and aralkyl radicals; and Z is selected from the group consisting of alkylene, arylene, and aralkylene radicals.
- 4. A composition of claim 3 wherein x is 65.6, y is 6.1, Z' is --CH.sub.3, Z is --C.sub.3 H.sub.6 --, m is 23, n is 20.2.
- 5. A composition of claim 1 wherein said polysiloxane has a molecular weight of 2000-15,000.
- 6. A composition of claim 1 wherein said polysiloxane has a molecular weight of 4000-8000.
- 7. A composition of claim 1 wherein said polysiloxane has a viscosity of 1-100,000 centistokes.
- 8. A composition of claim 1 wherein R, R', and R" are organic radicals attached to silicon by carbon to silicon bonds, by carbon-oxygen-silicon bonds, or by carbon-sulfur-silicon bonds.
- 9. A composition of claim 1 wherein R is selected from the group consisting of R'"--OH, R'"--CHOHCH.sub.2 OH, R'"--CHOHCH.sub.3, R'"--SH, R'"--CH.sub.2 SH, --R'"--SCH.sub.2 CO.sub.2 H wherein R'" is a divalent linking group composed of carbon and hydrogen; carbon, hydrogen, and oxygen; carbon, hydrogen, and sulfur; or carbon, hydrogen, oxygen, and sulfur.
- 10. A composition of claim 1 wherein R is --CH.sub.2 CH.sub.2 CH.sub.2 O--[CH.sub.2 CH(CH.sub.3)O].sub.n --H where n=1-5.
- 11. A composition of claim 10 having a hydroxyl equivalent weight of between 500 and 2,000.
- 12. A composition of claim 10 wherein said polysiloxane has the general formula:
- (CH.sub.3).sub.3 SiO[Si(CH.sub.3).sub.2 O].sub.66 [Si(CH.sub.3 (C.sub.3 H.sub.6 O(CH.sub.2 CH(CH.sub.3)O).sub.2.5 H)O].sub.3 Si(CH.sub.3).sub.3.
- 13. A composition of claim 1 wherein said polysiloxane has the general formula:
- (CH.sub.3).sub.3 SiO[Si(CH.sub.3).sub.2 O].sub.63 [SiCH.sub.2 CH.sub.2 CH.sub.2 OCH.sub.2 CHOHCH.sub.2 OH)(CH.sub.3)O].sub.7 Si(CH.sub.3).sub.3.
- 14. A composition of claim 1 wherein said polysiloxane has the general formula:
- (CH.sub.3).sub.3 SiO[Si(CH.sub.3).sub.2 O].sub.65 [SiCH.sub.2 CH.sub.2 CH.sub.2 OCH.sub.2 CHOHCH.sub.2 OH)(CH.sub.3)O].sub.5 Si(CH.sub.3).sub.3.
- 15. A composition of claim 1 wherein said polysiloxane has the general formula:
- (CH.sub.3).sub.3 SiO[Si(CH.sub.3).sub.2 O].sub.56 [SiCH.sub.2 CH.sub.2 CH.sub.2 OCH.sub.2 CHOHCH.sub.2 OH)(CH.sub.3)O].sub.14 Si(CH.sub.3).sub.3.
- 16. A composition of claim 1 wherein said polysiloxane has the general formula:
- (CH.sub.3).sub.3 SiO[Si(CH.sub.3).sub.2 O].sub.134 [SiCH.sub.2 CH.sub.2 CH.sub.2 OCH.sub.2 CHOHCH.sub.2 OH)(CH.sub.3)O].sub.16 Si(CH.sub.3).sub.3.
- 17. A composition of claim 1 wherein R is CH.sub.2 CH.sub.2 SCH.sub.2 CH.sub.2 OH.
- 18. A composition of claim 1 wherein said organic polyisocyanate is an aromatic polyisocyanate.
- 19. A composition of claim 18 wherein said aromatic polyisocyanate is selected from the group consisting of the isomers of toluene diisocyanate, the isomers of diphenylmethane diisocyanate, and the isomers of methylene bridged diphenylmethane diisocyanate.
- 20. A composition of claim 19 wherein said diphenylmethane diisocyanate contains minor amounts of uretonimine, carbodiimide or low molecular weight polyol modified diphenylmethane diisocyanate.
- 21. In the process of reaction injection molding of polyurethane, polyurea, or polyurethaneurea resins which includes the mixing of polyol and/or polyamines, and/or polyolamines with polyisocyanates and catalysts, and the molding and curing of the foregoing ingredients in a metal mold, the improvement which comprises including with said polyisocyanate a composition of claim 1.
- 22. A process of claim 21 wherein said polyisocyanate is a composition of claim 12.
Parent Case Info
This is a continuation-in-part of application Ser. No. 486,269 filed Apr. 18, 1983 now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3993606 |
Bonin et al. |
Nov 1976 |
|
4024090 |
Bonin et al. |
May 1977 |
|
4457887 |
Porsche |
Jul 1984 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
117524 |
Jul 1982 |
JPX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
486269 |
Apr 1983 |
|