US 5,672,632 AGranted

Integral skin polyurethane molded articles

AssigneeBASF SE

InventorsValeri L. Voloppi, Thirumurti Narayan

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Abstract

The present invention relates to water-blown integral skin polyurethane foam compositions, molded polyurethane articles, a process of preparing said articles, and an isocyanate composition for use therein. In particular, the invention relates to water-blown integral skin molded polyurethane articles having particularly advantageous physical properties, and compositions useful for producing such articles. In particular, the invention provides a polyurethane composition which has an isocyanate component (a) an isocyanate reactive component (b), a blowing agent comprising water (c), a polyether (d) selected from the group consisting of polytetrahydrofuran and polyethylene glycol having a number average molecular weight of from 200 to 2000 and optionally, one or more additives (e) from the group consisting of catalysts, chain extenders, oxo alcohols, and mixtures thereof. The composition may be characterized in that the integral skin polyurethane articles made of the composition have a tensile strength of greater than or equal to 450 psi and/or a Taber abrasion (mg loss) of less than 200.

Claims18

Dependent claims

An integral skin polyurethane molded article, obtained from the process comprising:

providing an isocyanate component (a), comprising the reaction product of
(a1) a polyoxypropylated propylene glycol having an OH number from 200 to 300;
(a2) a diol selected from the group consisting of dipropylene glycol and tripropylene glycol;
(a3) a polyoxypropylated/ethoxylated glycerin having an OH number from 20 to 50;
(a4) a polyoxypropylated/ethoxylated glycol having an OH number from 15 to 45;
and
(a5) diphenylmethane diisocyanate;
providing a resin side (I) comprising:
an isocyanate reactive component (b);
a blowing agent (c) comprising water;
a polyether (d) selected from the group consisting of polytetrahydrofuran and polyethylene glycol having a number average molecular weight of from 200 to 2000;
and
optionally, one or more additives (e) selected from the group consisting of catalysts, chain extenders, and mixtures thereof,
introducing the isocyanate component (a) and resin side (I) into a mold;
and
reacting component (a) and resin side (I) together for a time sufficient to produce an integral skin polyurethane article;
wherein the resulting integral skin polyurethane article is characterized by one or more of the following performance properties:
(i) tensile strength of greater than or equal to 450;
(ii) a Taber abrasion (mg loss) of less than 200.

16 more elements

Dependencies are inferred from the claim text.