High TG surface covering wear layer and seam coater
US5140088A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1991 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Jan 22, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/792
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.