DETAILED DESCRIPTION The embodiments of the invention in which an exclusive privilege or property is claimed are defined as follows: 1.
In the process for the preparation of a noncellular, solid urethane polymer composition prepared by the reaction of a polyoxyalkylene polyether polyol with an organic polyisocyanate in the absence of a trimization catalyst, the improvement comprising the addition of from about 2 percent by weight to 75 percent by weight based upon the total weight of the polyether polyol and the organic polyisocyanate, an isocyanate-free, hydroxyl group-free reaction product of an organic isocyanate with a monohydric or polyhydric compound containing from 1 to 4 hydroxyl groups and from 2 to 18 carbon atoms prior to said reaction.
2.
The process of claim 1 wherein said organic isocyanate is selected from the group consisting of phenyl isocyanate, toluene diisocyanate and diphenylmethane diisocyanate.
3.
The process of claim 1 wherein said monohydric or polyhydric compound is selected from the group consisting of butanol, 2-ethylhexanol, glycerine, cyclohexanol, dipropylene glycol, butylene glycol, trimethylolpropane and pentaerythritol.
4.
The process of claim 1 wherein said monohydric or polyhydric compound is selected from the group consisting of 2,4,4,4-tetrachloro-1-butanol, 2,3-dichloropropanol, 2,3,-dibromopropanol, 2-chloroethanol, 1,1,1,3,3,3-hexachloro-2-propanol, pentachlorophenol, 2-methylol-1,4,5,6,7,7-hexachlorobicyclo-2.
2.
1)-5-heptene, tetrabromobisphenol A, dibromobisphenol A, 2,3,-dibromobutanediol-1,4, dibromoneopentyl glycol, and 1,1,1-trichloro-2-propanol.
Description:
BACKGROUND OF THE INVENTION 1.
Field of the Invention This invention relates to polyurethanes and more particularly to rigid, dense, rapid-setting polyurethane molded compositions.
2.
Description of the Prior Art Rapid-setting polyurethane compositions are disclosed in U.
S.
Pat.
No.
3,378,511 in which there is disclosed the reaction of a polyether polyol and a polyisocyanate in the presence of a modifying composition consisting of an ester such as dioctylsebacate, dioctylphthalate, and mixtures thereof
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