Potassium catalyst system for preparing polyurethane based plywood-patch compositions
AssigneeGeorgia-Pacific Resins, Inc.
InventorsFrank Bock, Mahfooz Ahmad, Frederick C. Dupre, Jr.
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Abstract
A plywood-patching composition is provided based on a noncellular polyurethane elastomer prepared by reacting a polyether or polyester polyol with a polyisocyanate in the presence of a catalytic amount of a substantially anhydrous potassium salt of a carboxylic acid having from 2 to about 20 carbon atoms, and process for preparing same. The catalysts utilized are relatively non-toxic, yet they promote rapid polymerization with essentially no foaming for a wide variety of non-cellular polyurethane elastomeric applications, particularly in plywood-patch applications where even small amounts of foaming is deleterious to the properties thereof.
Claims19
A process for preparing a polyurethane elastomer consisting essentially of the step of reacting a polyol selected from polyether polyols and polyester polyols with an organic polyisocyanate wherein the ratio of NCO groups to hydroxyl groups is from greater than about 1.00 to 1 to about 2.0 to 1 in the presence of a catalytic amount of a substantially anhydrous potassium salt of a carboxylic acid having from 2 to about 20 carbon atoms in the molecule.
A process for preparing a polyurethane elastomer consisting essentially of the step of reacting a polyol selected from polyether polyols and polyester polyols with an organic polyisocyanate, in the presence of an effective amount of a chain extender, wherein the ratio of NCO groups to hydroxyl groups is from greater than about 1.00 to 1 to about 2.0 to 1, in the presence of a catalytic amount of a substantially anhydrous potassium salt of a carboxylic acid having from 2 to about 20 carbon atoms in the molecule.
A plywood-patch composition based on a non-cellular polyurethane elastomer, said plywood-patch composition comprising the reaction product of a Component A and a Component B in the presence of a catalytic amount of a substantially anhydrous potassium salt of a carboxylic acid having from 2 to about 20 carbon atoms in the molecule,
- wherein said Component A comprises
- (a) from about 20 to about 32% w of a poly(oxyalkylene)triol,
- (b) from 0 to about 7% w of a poly(oxyalkylene)diol,
- (c) from 0 to about 2.5% w of a compatibilizer for said Component A and said Component B.
- (d) from about 5.5% w to about 6.5% w of a solvent for said Component A having a flashpoint of less than about 110.degree. F.,
- (e) from 0 to about 1.5% w of a dessicant,
- (f) from 0 to about 0.45% w of a thixotrope,
- (g) from about 30 to about 70% w of a filler,
- (h) from 0 to about 0.15% w of a pigment, and
- (i) from 0 to about 0.25% w of an anti-settling agent,
- wherein Component B is an organic polyisocyanate and
- wherein the ratio of NCO groups to hydroxyl groups is from greater than about 1.00 to 1 to about 2.0 to 1.
A process for preparing a plywood-patch composition based on a non-cellular polyurethane elastomer consisting essentially of the step of reacting a Component A and a Component B in the presence of a catalytic amount of a substantially anhydrous potassium salt of a carboxylic acid having from 2 to about 20 carbon atoms in the molecule,
- wherein said Component A is prepared by mixing
- (a) from about 20 to about 32% w of a poly(oxyalkylene)triol,
- (b) from 0 to about 7% w of a poly(oxyalkylene)diol,
- (c) from 0 to about 2.5% w of a compatibilizer for said Component A and said Component B,
- (d) from about 5.5 to about 6.5% w of a solvent for said Component A having a flashpoint of less than about 110.degree. F.,
- (e) from 0 to about 1.5% w of a dessicant,
- (f) frm 0 to about 0.45% w of a thixotrope,
- (g) from about 30 to about 70% w of a filler,
- (h) from 0 to about 0.15% w of a pisgment, and
- (i) from 0 to about 0.25% w of an anti-settling agent,
- wherein Component B is an organic polyisocyanate and
- wherein the ratio of NCO groups to hydroxyl groups is from greater than about 1.00 to 1 to about 2.0 to 1.
Dependencies are inferred from the claim text.