Claims
- 1. A high modulus, high strength, melt-processible polyester consisting essentially of recurring units (I), (II), (III) and (IV): ##STR19## wherein said polyester has a melting point in the range of from about 250.degree. to 360.degree. C.
- 2. The polyester of claim 1 having a heat distortion temperature of about 240 under a load of 264 psi when filled with 30 weight percent glass fiber and a fiber pull rating of at least 2.
- 3. The polyester of claim 1 wherein the sum of the number of units of (II) and (III) is approximately equal to the number of unit (I); and unit (IV) ranges from about 0.075 to 1.5 moles per each mole of unit (I).
- 4. A high modulus, high strength, melt-processible polyester consisting essentially of recurring units (I), (II), (III), and (IV): ##STR20## having a melting point in the range of from about 250.degree. to 360.degree. C., and when filled with 30 percent by weight glass fibers, has an HDT of about 240.degree. C. under a load of 264 psi and ability to form strong fibers.
- 5. The polyester of claim 4 wherein the percentage of units (I), (II), (III) and (IV) falls within area C circumscribed on the attached triangular phase diagram of FIG. 1.
- 6. The polyester of claim 4 wherein the sum of the number of units of (II) and (III) is approximately equal to (I); and unit (IV) ranges from about 0.075 to 1.5 moles per each mole of unit (I).
- 7. The method of preparing the polyester of claim 1 which comprises reacting hydroquinone, isophthalic acid, terephthalic acid and hydroxybenzoic acid in a solvent comprising an anhydride of a lower monocarboxylic acid.
- 8. The process of claim 7 wherein said reaction is carried out in the presence of a salt selected from the group consisting of an alkaline earth metal salt and an alkali metal salt.
- 9. The method of preparing the polyester of claim 4 which comprises reacting hydroquinone, isophthalic acid, terephthalic acid and hydroxybenzoic acid in a solvent comprising an anhydride of a lower monocarboxylic acid.
- 10. A high modulus, high strength, melt-procesible polyester consisting essentially of recurring units (I), (II), (III), and (IV) falling within area C on the attached triangular phase diagram of FIG. 1.
Parent Case Info
This is a continuation-in-part of U.S. Ser. No. 255,670, filed Oct. 11, 1988, and a continuation-in-part of U.S. Ser. No. 255,632, filed Oct. 11, 1988.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/US89/04331 |
10/10/1989 |
|
|
6/4/1990 |
6/4/1990 |
US Referenced Citations (15)
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
255670 |
Oct 1988 |
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