Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1983-07-05
1984-09-18
Cockeram, Herbert S.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
252182, 264 51, 2643286, 264DIG83, 521111, 521112, 528 48, 528 49, B28B 124, C08G 1814
Patent
active
044723415
ABSTRACT:
Disclosed is an improved process for the production of organic polyisocyanate based molded polymers prepared from at least one organic polyisocyanate and at least one polyol in the presence of an internal release agent wherein the improvement comprises employing as said agent a polysiloxane having at least one unit of the formula ##STR1## wherein R is selected from the group consisting of lower-alkyl and aryl, R.sup.1 is a divalent hydrocarbon radical, and R.sup.2 is selected from the group consisting of lower-alkoxy, aryloxy, particular hydroxyalkyleneoxy, alkoxyalkyleneoxy, amino, and hydroxyalkylamino radicals.
The molding process can be repeated in many cycles before the molds require cleaning or treatment with release agent. The ease and rapidity with which the present process can be carried out makes it particularly suited to RIM production methods.
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New Product Information: Dow Corning.RTM., Q2-7119, Fluid for RIM Internal Release, (Dow Corning Corp., Midland, Mich.).
Alberino Louis M.
Regelman Dale F.
Temme George H.
Cockeram Herbert S.
Firth Denis A.
Rose James S.
The Upjohn Company
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