Melt-stable copolyester resins and molded articles thereof
US5300332A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1993 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Feb 11, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2913
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A modified polyester resin is the reaction product of: PA0 (A) an acid component mainly comprised of terephthalic acid, 2,6-naphthalene dicarboxylic acid or a lower alcohol ester thereof, PA0 (B) a diol component mainly comprising an alkylene glycol having 2 to 8 carbon atoms, and PA0 (C) an aromatic sulfonic acid compound of the following general formula (1): EQU HO(RO).sub.n --Ar--SO.sub.3 M (1) PA0 where Ar represents a benzene or naphthale ring, n represents an integer from 1 to 10, R represents a group selected from among alkylenes having 2 or 3 carbon atoms and when n is 2 or more, R may be the same as or different from one another, and M represents an alkali metal selected from lithium, sodium and potassium. The modified polyester resin also satisfies the following formulas (2) and (3): EQU 0.25.ltoreq.x.ltoreq.100 (meq/kg) (2) EQU 2.ltoreq.(x/CEG).times.100.ltoreq.150 (%) (3) PA0 where x represents the amount of the aromatic sulfonic acid compound represented by the above general formula (1) introduced thereinto and CEG represents the amount of the carboxy end groups, and x and CEG are each expressed in millequivalent per kilogram (meq/kg) of the polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.