Process for preparing polyurethane carpet backings based on high equivalent weight polyols
AssigneeThe Dow Chemical Company
InventorsRobert B. Turner, Randall C. Jenkines, John F. Serratelli, Garland R. Barnes
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Abstract
Polyurethane-backed textiles are prepared from a polyurethane-forming composition employing a polyether polyol having an equivalent weight of at least about 1000, a specified functionality and an internal poly(ethylene oxide) block or a terminal ethylene oxide end cap of at least about 15% by weight. The use of these polyether polyols provides a particularly desirable combination of processing and physical characteristics.
Claims10
In a process for preparing a polyurethane-backed textile wherein an uncured polyurethane-forming composition is applied to a surface of the textile, gauged and cured to form an adherent backing thereto, the improvement comprising employing a frothed polyurethane-forming composition comprising
- (A) a polyol based on a C.sub.3 -C.sub.8 alkylene oxide, which polyol has an equivalent weight of about 1000 to about 5000, and an internal poly(ethylene oxide) block or a terminal ethylene oxide cap constituting about 15 to about 30 percent of the weight of the polyol, or mixture of such polyols, wherein said polyol or mixture thereof has an average functionality of about 1.8 to about 2.2,
- (B) a minor amount of a low equivalent weight compound having about 2 active hydrogen containing groups per molecule, and
- (C) a polyisocyanate having an average functionality of about 1.9 to about 2.4, in an amount to provide the composition with about 0.9 to about 1.3 isocyanate groups per active hydrogen containing group, and
- (D) an effective amount of a blowing agent.
A process for preparing a polyurethane-backed textile, comprising the steps of
- (A) applying to a surface of a textile a layer of a polyurethane-forming composition comprising
- (1) a polyol based on a C.sub.3 -C.sub.8 alkylene oxide, which polyol has an equivalent weight of about 1000 to about 5000, and an internal poly(ethylene oxide) block or a terminal ethylene oxide cap constituting about 15 to about 30 percent of the weight of the polyol, or mixture of such polyols, wherein said polyol or mixture thereof has an average functionality of about 1.8 to about 2.2,
- (2) a minor amount of a low equivalent weight compound having about 2 active hydrogen containing groups per molecule, and
- (3) a polyisocyanate having an average functionality of about 1.9 to about 2.4, in an amount to provide the composition with about 0.9 to about 1.25 isocyanate groups per active hydrogen containing group, and
- (4) an effective amount of a blowing agent, and
- (B) curing said polyurethane-forming composition to form a cellular polyurethane backing adherent to said textile.
Dependencies are inferred from the claim text.