Low melt viscosity amorphous copolyesters with enhanced glass transition temperatures
US6120889A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1999 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Jun 3, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249921
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to an amorphous copolyester having a maximum melt viscosity at 1 radian/second and at about 260 to about 290.degree. C. of about 12000 poise, a glass transition temperature ranging from about 88.degree. C. to about 120.degree. C., and an inherent viscosity of at least about 0.6 dl/g. The amorphous copolyesters comprise the reaction product of a diol component and a dicarboxylic acid component. The diol component comprises residues of from about 5.0 to about 50 mole % of 2,2'-(sulfonylbis(4,1 -phenyleneoxy))-bis(ethanol) which has the following chemical formula: ##STR1## and from about 50 to about 95 mole % of a mixture of at least two diols selected from the group consisting of ethylene glycol, neopentyl glycol, 1,3-propanediol, 1,4-butanediol, 1,4-cyclohexanedimethanol, and mixture thereof. The dicarboxylic acid component comprises residues of terephthalic acid, isophthalic acid, 1,4-cyclohexandedicarboxylic acid, 2,6-naphthalene dicarboxylic acid and mixtures thereof. The amorphous copolyesters according to the invention have relatively low melt viscosities and relatively high glass transition temperatures. Because of the low melt viscosities and high glass …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.