US 5,081,211 AGrant
Polyisocyanate Compositions
Issue Date:1992-01-14
•8 Claims
Abstract
Polyisocyanate compositions with useful properties are obtained by reacting uretonimine and/or carbodiimide modified polyisocyanates with carboxylic acids. The polyisocyanate compositions are useful in the preparation of elastomeric products.
Metadata
Assignee
- Imperial Chemical Industries PLC
Inventors
- Eduard F. Cassidy
- Jan W. Leenslag
Application Information
Application Number:US 4006399
Filing Date:1989-08-30
Priority Date:1987-10-06
Art Unit:153
Classifications
IPC:
C08G 1877C08G 1878C08G 1879
Field of Search:
52867;68;76;83
Patent Drawings
This patent does not have any drawings.
Description
Example 1
Prepolymer 1, having an isocyanate content of 26.51% by weight, was prepared by reacting 15 parts of a 3600 Mw carboxylic acid-ended difunctional liquid nitrile rubber (HYCAR.RTM. 1300 X 8, B. F. Goodrich Co.) with 85 parts of a 20% uretonimine/carbodiimide modified 4,4'-diphenylmethane diisocyanate having an NCO content of 29.5%. The reaction was carried out at 100.degree. C. for 2 hours.
Example 2
Prepolymer 2, having an isocyanate content of 26% by weight, was prepared by reacting 15 parts of a 600 Mw carboxylic acid-ended difunctional unsaturated fatty acid dimer (EMPOL.RTM. 1009, Unichema) with 85 parts of a 20% uretonimine/carbodiimide modified 4,4'-diphenyl methane diisocyanate. The reaction was carried out at 100.degree. C. for 2 hours.
Example 3
Prepolymer 3, having an isocyanate content of 25.19% by weight, was prepared by reacting 13 parts of a 600 Mw carboxylic acid-ended difunctional unsaturated fatty acid dimer (EMPOL.RTM. 1009, Unichema ) with 87 parts of a 20% uretonimine/carbodiimide modified 4,4'-diphenylmethane diisocyanate. The reaction was carried out at 100.degree. C. for 2 hours.
Example 4
Prepolymer 4, having an isocyanate content of 23.57% by weight, was prepared by reacting 20 parts of a 3600 Mw carboxylic acid-ended difunctional liquid nitrile rubber (HYCAR.RTM. 1300 X 8, B. F. Goodrich Co.) with 80 parts of a 20% uretonimine/carbodiimide modified 4,4'-diphenylmethane diisocyanate. The reaction was carried out at 100.degree. C. for 2 hours.
Example 5
Prepolymer 5, having an isocyanate content of 23.57% by weight, was prepared by reacting 20 parts of a 2200 Mw carboxylic acid-ended polyoxypropylene glycol (maleic anhydride capped PPG 2000) with 80 parts of a 20% uretonimine/carbodiimide modified 4,4'-diphenylmethane diisocyanate. The reaction was carried out at 100.degree. C. for 2 hours.
The carboxy-terminated polyether used in this Example was prepared as follows:
A solution of 3.35 parts of potassium hydroxide in 3.35 parts of water was mixed with 200 parts of polypropylene glycol of molecular weight 2000. The water was removed by stirring under reduced pressure at 80.degree. C. after which 19.6 parts of maleic anhydride was added. Stirring was continued for a further 2 hours, the end of the reaction being observed by the disappearance of the anhydride absorption band at 1840 cm.sup.-1 in the infra-red spectrum.
Polyurea elastomers were prepared using the reaction injection moulding (RIM) process by injecting two liquid streams, maintained at ca. 40.degree. C., of polyisocyanate and polyamine, under pressure (ca. 200 bar), into a closed mould for subsequent reaction. The steel mould employed was of the dimensions 30 cm .times.30 cm.times.3 mm, and was maintained at ca. 90.degree. C. The elastomers were removed from the mould 20 seconds after injection, and were post thermally treated by placing them in a vented oven maintained at ca. 160.degree. C. for ca. 30 minutes. Physical properties of the elastomers were measured within 3 days of their post thermal treatment.
Example 6
Polyurea elastomer 1 was prepared, using the RIM process previously described, by reacting 41.52 parts of prepolymer 4 with 40.94 parts of a 5000 Mw polyoxypropylene triamine and 17.54 parts of an 80/20 isomer mixture of 2,4- and 2,6-diethyltoluene diamines (DETDA).
Example 7
Polyurea elastomer 2 was prepared by reacting 43.82 parts of prepolymer 4 with 39.33 parts of the polyether triamine used in Example 6 and 16.85 parts of DETDA.
Example 8
Polyurea elastomer 3 was prepared by reacting 41.52 parts of prepolymer 5 with 40.94 parts of the polyether triamine used in Example 6 and 17.54 parts of DETDA.
Example 9
Polyurea elastomer 4 was prepared by reacting 43.82 parts of prepolymer 5 with 39.33 parts of the polyether triamine used in Example 6 and 16.85 parts of DETDA.
Example 10
Comparative Example
Prepolymer 6, having an isocyanate content of 23.5% by weight, was prepared by reacting 25 parts of a 2000 MW polyoxypropylene glycol with 65 parts of an 80/20 mixture of 4,4'- and 2,4'-diphenylmethane diisocyanates. 10.0 parts of a uretonimine/carbodiimide modified diphenylmethane diisocyanate having an isocyanate content of 29.5% by weight was stirred into this prepolymer after preparation.
Example 11
Comparative Example
Prepolymer 7, having an isocyanate content of 20.92% by weight, was prepared by reacting 33.88 parts of a 5000 MW polyoxpropylene triol with 56.12 parts of an 80/20 mixture of 4,4'- and 2,4'-diphenylmethane diisocyanates. 10.0 parts of a uretonimine/carbodiimide modified diphenylmethane diisocyanate having an isocyanate content of 29.5% by weight was stirred into this prepolymer after preparation.
Example 12
Comparative Example
Polyurea elastomer 5, not pertaining to this invention, was prepared according to the RIM process previously described. It was prepared by reacting 39.39 parts of prepolymer 6 with 44.24 parts of the polyether triamine used in Example 6 and 16.37 parts of DETDA.
Example 13
Comparative Example
Polyurea elastomer 6, not pertaining to this invention, was prepared according to the RIM process by reacting 44.44 parts of prepolymer 7 with 38.89 parts of the polyether triamine used in Example 6 and 16.67 parts of DETDA.
All elastomers prepared according to the present invention showed higher modulus and improved modulus/impact combinations than those of the comparative Examples. Also, elastomers prepared according to the present invention showed improved thermal stability over those of the comparative Examples.
Claims
We claim:
1. A reaction system for use in making a reaction injection moulded elastomer, said system comprising the following components: A) a polyisocyanate composition which is the product of reacting a uretonimine and/or carbodiimide modified polyisocyanate with a carboxy terminated polycarboxylic acid polyether or polyester, and B) an isocyanate-reactive component comprising at least one softblock component selected from polyols, polyamines, imino-functional compounds, enamine-containing compounds and mixtures thereof having equivalent weights of at least 750 and at least one chain extender selected from polyols, polyamines, imino-functional compounds, enamine-containing compounds and mixtures thereof having equivalent weights below 750.
2. A reaction system according to claim 1 wherein the chain extender comprises an aromatic diamine having a molecular weight from about 100 to about 400.
3. The reaction system of claim 1 wherein the uretonimine and/or corbodiimide modified polyisocyanate comprises a uretonimine and/or carbodiimide modified aromatic polyisocyanate.
4. The reaction system of claim 3 wherein the uretonimine and/or carbodiimide modified aromatic polyisocyanate comprises a uretonimine and/or carbodiimide modified diphenylmethane diisocyanate.
5. The reaction system of claim 1 wherein the carboxy terminated polycarboxylic acid polyether or polyester is liquid at 120.degree. C. or below.
6. The reaction system of claim 1 wherein the polyisocyanate composition is the product of reacting a uretonimine and/or carbodiimide modified polyisocyanate with a polycarboxylic acid polyether which is a carboxy terminated polyether having one or more carboxy groups at each chain end.
7. The reaction system of claim 6 wherein the carboxy terminated polyether comprises a carboxy terminated reaction product of a polyoxyalkylene polyol having a hydroxyl functionality of from 2 to 8 and an average molecular weight of from 200 to 10,000 and a tricarboxylic acid anhydride or a tetracarboxylic acid dianhydride.
8. The reaction system of claim 1 wherein the polyisocyanate composition is the product of reacting a uretonimine and/or carbodiimide modified polyisocyanate with a carboxy terminated polycarboxylic acid polyether or polyester at a temperature below 120.degree. C., in the absence of a catalyst, and with an initial ratio of uretonimine/carbodiimide to carboxy groups of at least 1:1.
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