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US 4,045,527 AGranted
Polyurethane and composite thereof
AssigneeHitco
InventorsEduard P. Babayan, Michael H. Rourke
Life of this patent
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Abstract
A low toxicity, castable, fast curing, polyurethane high strength elastomer is prepared from a liquid prepolymer diol, a cycloaliphatic diisocyanate, a polyalkanol amine and a small amount of soluble metal salt catalyst. The composition can be formulated by either a prepolymer or "one-shot" technique and cures at ambient temperature.
Claims18
A mobile, curable, reactive sealant, casting or potting composition consisting essentially of;
- 100 parts of a liquid prepolymeric polytetramethylene glycol polyol resin having a functionality from 1.7 to 3.5 and a molecular weight from 500 to 5,000;
- 0.05 to 0.2 parts per 100 parts of glycol prepolymer resin (phr) of a metal salt curing catalyst selected from the group consisting of dibutyltindilaurate, zinc octoate, lead octoate and zirconium acetylacetonate;
- and
- - 20phr of a tetraalkanol amine curing agent of the formula:
- ##STR3## where R.sup.2 is alkylene of 2-6 carbon atoms and R.sup.4 is selected from straight or branch chain alkylene or polyether containing 1-8 carbon atoms;
- and
- 5- 70parts by weight of a diisocyanate, at least 50% by weight of which is a cycloaliphatic isocyanate selected from compounds of the formula:
- ##STR4## where R.sup.1 is alkylene of 1- 10 carbon atoms and R.sup.3 is a lower alkyl of 1-8 carbon atoms.
5 more elements
A method of forming a cured, elastomeric, hydrolytically stable resin comprising the steps of:
- mixing a first part consisting essentially of in relative parts by weight;
- 100 parts of a liquid prepolymeric polytetramethylene glycol polyol resin having a functionality from 1.7 to 3.5 and a molecular weight from 500 to 5,000;
- 0.05 to 0.2 parts per 100 parts of glycol prepolymer resin (phr) of a metal salt curing catalyst selected from the group consisting of dibutyltindilaurate, zinc octoate, lead octoate and zirconium acetylacetonate;
- and
- 4-20 phr of a tetraalkanol amine curing agent of the formula:
- ##STR5## where R.sup.2 is alkylene of 2-6 carbon atoms and R.sup.4 is selected from straight or branch chain alkylene or polyether containing 1-8 carbon atoms;
- with
- a second part consisting essentially of 50-70 parts by weight of a diisocyanate, at least 50% by weight of which is a cycloaliphatic isocyanate selected from compounds of the formula:
- ##STR6## where R.sup.1 is alkylene of 1- 10 carbon atoms and R.sup.3 is a lower alkyl of 1-8 carbon atoms to form a mobile composition;
- and
- curing the mobile composition to a fully cured, rigid state.
8 more elements
Dependencies are inferred from the claim text.