US4267303A
Expired / Lapsed
US
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Process for the preparation of polymers with diphenol carbonate end groups
Assignee: Bayer AG
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Filing: 1979-08-27
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Granted: 1981-05-12
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Expires: 1999-08-27
Abstract
Abstract This disclosure is concerned with a single step process for the production of diphenol terminated polycarbonates by the transesterification of diphenols, bis-aryl carbonates and polymeric diols with aliphatically bound terminal hydroxyl groups. These diols are selected from polyesters, polyethers, polythioethers and polyacetals. The transesterification is carried out at elevated temperatures under vacuum optionally in the presence of a catalyst with the ratios of the reactants being such as to avoid the retention of any terminal aliphatic hydroxyl groups or aryl carbonate groups.
Inventors
- 👤 Klaus Konig
- 👤 Manfred Schreckenberg
- 👤 Christian Lindner
- 👤 Carlhans Suling
- 👤 Dieter Freitag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:05
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64; C08G64/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
167 words
A process for the preparation of a polymer with diphenol carbonate end groups, characterized in that (a) a diol selected from polyester-diols, and polyacetal-diols with average molecular weights of Mn (number average) 300-6,000, (b) a carbonic acid bis-aryl ester and (c) a diphenol are reacted together, a catalyst also being used if appropriate, at a temperature between 80° and 270° C. and under a vacuum of between 200 mg Hg and 0.1 mm Hg, n mols of diol, m mols of diphenol and p mols of carbonic acid bis-aryl ester being employed for the preparation of 1 mol of the polymer with diphenol carbonate end groups, n being a number from 1 to 20 and being chosen in each case such that the product of n and the molecular weight Mn (number average), increased by 26, of the diol employed is a number between 500 and 14,500, and m being any desired number between 2 and 5 and p being at least n+1, but at most (n+m)-1.
Claim 2
Dependent Claim
167 words
A process for the preparation of a polymer with diphenol carbonate end groups, characterized in that (a) a diol selected from polyester-diols, and polyacetal-diols with average molecular weights of Mn (number average) 300-6,000, (b) a carbonic acid bis-aryl ester and (c) a diphenol are reacted together, a catalyst also being used if appropriate, at a temperature between 80° and 270° C. and under a vacuum of between 200 mg Hg and 0.1 mm Hg, n mols of diol, m mols of diphenol and p mols of carbonic acid bis-aryl ester being employed for the preparation of 1 mol of the polymer with diphenol carbonate end groups, n being a number from 1 to 20 and being chosen in each case such that the product of n and the molecular weight Mn (number average), increased by 26, of the diol employed is a number between 500 and 14,500, and m being any desired number between 2 and 5 and p being at least n+1, but at most (n+m)-1.
Claim 3
Dependent Claim
24 words
The process of claim 1, wherein the starting diol (a) is selected from those with average molecular weights of Mn (number average) about 500-4,000.
Claim 4
Dependent Claim
77 words
A process according to claim 1 or 2, characterized in that the diol (a) is selected from (i) polyester-diols formed by the reaction of a dihydric alcohol and a dibasic carboxylic acid (or an anhydride or lower alkyl ester thereof), or by the polymerization of a lactone or by the condensation of a hydroxycarboxylic acid with a starter compound containing hydroxyl groups, and (ii) polyacetal-diols formed by the acid condensation of a diol with an aliphatic aldehyde.
Claim 5
Dependent Claim
61 words
A process according to claim 3, characterized in that the carbonic acid bis-aryl ester (b) has the general formula ##STR8## in which Ar is an aryl radical with 6-18 carbon atoms, which is optionally substituted by C 1 -C 4 alkyl, nitro or halogen, the substituents being selected independently of one another and the Ar radicals optionally differing in their substituents.
Claim 6
Dependent Claim
58 words
The process of claim 4, characterized in that the diphenol (c) has the general formula ##STR9## in which X denotes a single bond, --CH 2 --, --C(CH 3 ) 2 -- ##STR10## --O--, --S--, --SO 2 --or, and ##STR11## Y 1 to Y 4 each denotes, independently of the others, hydrogen, C 1 --C 4 --alkyl or halogen.
Claim 7
Dependent Claim
24 words
The process of claim 1, wherein the reaction is effected in the presence, as a catalyst, of a transition metal compound or a base.
Claim 8
Dependent Claim
58 words
The process of claim 6, wherein the catalyst is a titanic acid tetraalkyl ester, a dialkyl-tin carboxylate, a tin dicarboxylate, a chelate of Fe, Zn, Co, Ni or Pb, a carboxylate of Pb, Co, Ni or Fe, a tertiary amine or an oxide, hydroxide, carbonate, alcoholate, phenolate or carboxylate of an alkali metal or an alkaline earth metal.
Claim 9
Dependent Claim
25 words
The process of claim 1, wherein a catalyst is present in an amount of about 0.0001 to 1% by weight of the total reaction mixture.
Claim 10
Dependent Claim
25 words
The process of claim 8, wherein a catalyst is present in an amount of about 0.001 to 0.1% by weight of the total reaction mixture.
Claim 11
Dependent Claim
17 words
The process of claim 1, wherein the reaction is effected at from about 100° to 220° C.
Claim 12
Dependent Claim
16 words
The process of claim 1, wherein the reaction is effected in the absence of a solvent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |