Paint adhesion for RIM parts
AssigneeAir Products and Chemicals, Inc.
InventorsIbrahim S. Bechara, Rocco L. Mascioli
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Abstract
The addition of a small amount of a halogen compound, e.g. chloroethyl phosphate, in a process producing elastomeric polyurethane RIM parts using tertiary amines as the chief catalyst component results in scavenging the residual amines after the part has been cured by annealing. The parts from such a process can be coated with a wide variety of enamels having a high solids content and completely cured to result in a higher degree of adhesive between the coating and the part's surface than those parts from a process without the use of such a halogen.
Claims6
An elastomeric composition for the production of RIM polyurethane products comprising per hundred parts of polyether polyol therein:
- 10 to 50 parts of a diol chain extender;
- 50 to 300 parts polyisocyanate;
- 0 to 4 parts of volatile fluorocarbon blowing agent,
- 0.1 to 1.0 parts of tertiary amine catalyst;
- and 0 to 0.2 parts of organo tin catalyst;
- together with 0.1 to 3 parts of a reactive organic halogen compound.
Dependencies are inferred from the claim text.