Process for the manufacture of polyester resins
Abstract
Abstract THE INVENTION PROVIDES A PROCESS FOR THE MANUFACTURE OF POLYESTER RESINS HAVING A HIGH FLEXURAL STRENGTH AND IMPACT STRENGTH. THIS IS ACHIEVED BY USING HIGH MOLECULAR WEIGHT POLYCARBOXYLIC ACID ESTERS PROCUCED AS BY-PRODUCT RESIDUES IN THE OXIDATION AND ESTERIFICATION OF P-XYLENE TO GIVE TEREPHTHALIC ACID ESTERS AND THE RECOVERY OF THE TEREPHTHALIC ACID ESTERS FROM THE REACTION MIXTURE. THE HIGH MOLECULAR WEIGHT POLYCARBOXYLIC ACID ESTERS ARE DISTILLED FROM THE RESIDUES, TRANSESTERIFIED WITH POLYHYDRIC ALCOHOLS, ESTERIFIED WITH MALEIC ACID AND CURED WITH OLEFINICALLY UNSATURATED COMPOUNDS SUCH AS STYRENE, ACRYLIC AND METHACRYLIC ESTERS AND DIALLYLPHTHALATE TO PRODUCE THE POLYESTER RESIN.
Inventors
- 👤 Josef Kaupp
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |