Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1991-01-22
1992-08-18
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
C08G 1830
Patent
active
051400880
ABSTRACT:
The floor covering of the present invention has a wear layer and/or seam coater which is a high T.sub.g urethane composition. While most floor covering urethanes have a T.sub.g of from 18.degree. C. to 23.degree. C., the T.sub.g of the present urethane is above about 40.degree. C., and preferably from about 48.degree. C. to about 55.degree. C. The T.sub.g of the prior art has been increased by altering the composition of the aromatic acid based polyester polyols used in the prior art moisture curable prepolymers. By raising the precursor polyol to dicarboxylic acid ratio, the polyester polyols produced have lower equivalent weights. This alone results in a polyurethane-urea of higher T.sub.g at a given alicyclic diisocyanate to polyester equivalent ratio. However, increases in the T.sub.g may also be obtained by replacing some or all of long chain flexible polyol precursors (e.g. triethylene glycol) with shorter and/or less flexible polyol precursors. The high T.sub.g improves stain resistance. The moisture cure of the present urethane composition can be carried out at ambient conditions, permitting its use as a seam coater or sealer as well as a wear layer.
REFERENCES:
patent: 4260717 (1981-04-01), Ehrhart
patent: 4440901 (1984-04-01), Reiff et al.
patent: 5004794 (1991-04-01), Emmerling et al.
Ehrhart Wendell A.
Petzold James R.
Armstrong World Industries Inc.
Welsh Maurice J.
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