US4031065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of thermoplastic polyester molding compositions of high viscosity
Assignee: BASF SE
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Filing: 1976-02-23
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Granted: 1977-06-21
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Expires: 1996-02-23
Abstract
Abstract Thermoplastic polyesters having a melt viscosity of more than 6,000 poise, as measured at 250° C, and a relative solution viscosity of more than 1.6, as measured on a 2:1 mixture of phenol/o-dichlorobenzene at 25° C, composed of aliphatic and/or cycloaliphatic diols on the one hand and dicarboxylic acids or esters thereof on the other hand and of from 0.1 to 10% molar of an aliphatic diol containing at least one olefinic double bond and/or of an aliphatic dicarboxylic acid containing at least one olefinic double bond or an ester thereof, said olefinic double bond not being directly adjacent to the carboxyl or ester groups. The polyesters are manufactured by melt polycondensation of diols with dicarboxylic acids or esters thereof, which polycondensation is carried out for at least some of the time at a temperature above 220° C and preferably above 230° C, the reaction being carried out in the presence of from 0.1 to 10% molar of an aliphatic diol containing at least one olefinic double bond and/or of an aliphatic dicarboxylic acid containing at least one olefinic double bond or an ester thereof, said olefinic double bond not being directly adjacent to the carboxyl or ester groups.
Inventors
- 👤 Claus Cordes
- 👤 Hans-Josef Sterzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:58
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C09; C09D; C09D167/00; C09D167/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
135 words
A process for the manufacture of thermoplastic polyesters having a melt viscosity of more than 6,000 poise, as measured at 250° C, and having a relative viscosity of more than 1.6, as measured in a 2:1 mixture of phenol and o-dichlorobenzene at 25° C, by polycondensation, in the melt, of aliphatic and/or cycloaliphatic diols with dicarboxylic acids and/or esters thereof, wherein the polycondensation is effected for at least some of the time at a temperature above 220° C and preferably above 230° C, and in the presence of from 0.1 to 10% molar of an aliphatic diol containing at least one olefinic double bond and/or of an aliphatic dicarboxylic acid containing at least one olefinic double bond or an ester thereof, the olefinic double bond not being directly adjacent to the carboxyl or ester groups.
Claim 2
Dependent Claim
135 words
A process for the manufacture of thermoplastic polyesters having a melt viscosity of more than 6,000 poise, as measured at 250° C, and having a relative viscosity of more than 1.6, as measured in a 2:1 mixture of phenol and o-dichlorobenzene at 25° C, by polycondensation, in the melt, of aliphatic and/or cycloaliphatic diols with dicarboxylic acids and/or esters thereof, wherein the polycondensation is effected for at least some of the time at a temperature above 220° C and preferably above 230° C, and in the presence of from 0.1 to 10% molar of an aliphatic diol containing at least one olefinic double bond and/or of an aliphatic dicarboxylic acid containing at least one olefinic double bond or an ester thereof, the olefinic double bond not being directly adjacent to the carboxyl or ester groups.
Claim 3
Dependent Claim
14 words
A process as claimed in claim 1, wherein the unsaturated diol used is butene-2-diol-1,4.
Claim 4
Dependent Claim
16 words
A process for the manufacture of thermoplastic poly(1,4-butylene terephthalate) molding compositions as claimed in claim 1.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 1, wherein the temperature is raised to values above 220° C and preferably above 230° C only in the final phase of the reaction.
Claim 6
Dependent Claim
23 words
A process as claimed in claim 1, wherein the temperature is maintained at a value above 230° C for at least 20 minutes.
Claim 7
Dependent Claim
46 words
A process as claimed in claim 1, wherein the polycondensation is carried out in the presence of from 0.001 to 2.0% and preferably from 0.5 to 0.2% by weight, based on the total amount of dicarboxylic acid or esters thereof, of a thermally unstable free-radical compound.
Claim 8
Dependent Claim
35 words
A process as claimed in claim 6, wherein the thermally unstable compound is one which dissociates to free radicals at temperatures of from 230° to 280° C with a half-life of less than 2 hours.
Claim 9
Dependent Claim
49 words
A process as claimed in claim 6, wherein the monomers used are mainly ethylene glycol and dimethyl terephthalate or terephthalic acid and polycondensation is carried to relative viscosities of more than 1.45, as measured on a 0.5% solution in a 3:2 mixture of phenol and o-dichlorobenzene at 25° C.
Claim 10
Dependent Claim
19 words
A process as claimed in claim 6, wherein the thermally unstable compound used is the polyrecombination product of diisopropylbenzene.
Claim 11
Dependent Claim
105 words
Thermoplastic polyesters having a melt viscosity of more than 6,000 poise, as measured at 250° C, and a relative viscosity of more than 1.6, as measured on a 2:1 mixture of phenol and o-dichlorobenzene at 25° C, consisting of aliphatic and/or cycloaliphatic diols on the one hand and dicarboxylic acids or esters thereof on the other hand and from 0.1 to 10% molar of an aliphatic diol containing at least one olefinic double bond and/or of an aliphatic dicarboxylic acid containing at least one olefinic double bond or an ester thereof, the olefinic double bond not being directly adjacent to the carboxyl or ester groups.
Claim 12
Dependent Claim
105 words
Thermoplastic polyesters having a melt viscosity of more than 6,000 poise, as measured at 250° C, and a relative viscosity of more than 1.6, as measured on a 2:1 mixture of phenol and o-dichlorobenzene at 25° C, consisting of aliphatic and/or cycloaliphatic diols on the one hand and dicarboxylic acids or esters thereof on the other hand and from 0.1 to 10% molar of an aliphatic diol containing at least one olefinic double bond and/or of an aliphatic dicarboxylic acid containing at least one olefinic double bond or an ester thereof, the olefinic double bond not being directly adjacent to the carboxyl or ester groups.
References Cited (Backward Citations)
US3940367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |