US4071507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of lactone polyesters
Assignee: DSM BV
•
Filing: 1973-04-06
•
Granted: 1978-01-31
•
Expires: 1993-04-06
Abstract
Abstract An improved process for polymerization of lactones or mixtures of lactones in the presence of an initiator and a catalyst is disclosed wherein the initiator is an organic compound having at least one non-cyclic ester group and having no reactive hydrogen substituents. A polyester having blocked end groups is produced.
Inventors
- 👤 Lowhardt A. A. Schoen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:40
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/823
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
93 words
A process for preparing polymeric lactones free of terminal reactive hydrogen substituents comprising polymerizing a polymerizable lactone with an initiator and in the presence of a catalyst, said initiator selected from the group consisting of ethyl acetate, propyl acetate, butyl acetate, 2-ethyl-hexyl acetate, ethyl benzoate, ethylene glycol diacetate, ethylene glycol dipropionate, ethylene glycol dibutyrate, ethylene glycol dibenzoate, diethylene glycol diacetate, diethylene glycol diproprionate, diethylene glycol dibutyrate, diethylene glycol dibenzoate, dimethyl terephthalate, di-(2-ethyl-hexyl)-adipate, diethyl adipate, dipropyl adipate, dibutyl adipate, dibenzyl adipate, triethylene glycol diacetate, triethylene glycol dipropionate, triethylene glycol dibutyrate and triethylene glycol dibenzoate.
Claim 2
Dependent Claim
93 words
A process for preparing polymeric lactones free of terminal reactive hydrogen substituents comprising polymerizing a polymerizable lactone with an initiator and in the presence of a catalyst, said initiator selected from the group consisting of ethyl acetate, propyl acetate, butyl acetate, 2-ethyl-hexyl acetate, ethyl benzoate, ethylene glycol diacetate, ethylene glycol dipropionate, ethylene glycol dibutyrate, ethylene glycol dibenzoate, diethylene glycol diacetate, diethylene glycol diproprionate, diethylene glycol dibutyrate, diethylene glycol dibenzoate, dimethyl terephthalate, di-(2-ethyl-hexyl)-adipate, diethyl adipate, dipropyl adipate, dibutyl adipate, dibenzyl adipate, triethylene glycol diacetate, triethylene glycol dipropionate, triethylene glycol dibutyrate and triethylene glycol dibenzoate.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the catalyst is selected from the group consisting of dibutyltin oxide, tetrabutyl dichlorodistannoxate, tetrabutyl chrlorohydroxydistannoxate, hexabutyl dichlorotristannoxate and hexabutyl chlorohydroxytristannoxate.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein 0.01 to 2 grams of catalyst is used for 100 grams of lactone.
Claim 5
Dependent Claim
25 words
The process of claim 1 wherein the polymerization is carried out at a temperature in the range of about 50° C to about 225° C.
Claim 6
Dependent Claim
26 words
The process of claim 1 wherein the lactone is a mixture of ε-caprolactone and ε-methyl-ε-caprolactone, the catalyst is sodium ethylate and the initiator is glycol diacetate.
Claim 7
Dependent Claim
17 words
The process of claim 5 wherein the molecular weight of the polymer is from 10,000 to 100,000.
Claim 8
Dependent Claim
27 words
The process of claim 1 wherein the lactone is ε-caprolactone, the catalyst is a mixture of tetrabutyl dichlorodistannoxate and hexabutyl dichlorotristannoxate and the initiator is glycol diacetate.
Claim 9
Dependent Claim
17 words
The process of claim 7 wherein the molecular weight of the polymer is from 10,000 to 100,000.
Claim 10
Dependent Claim
27 words
The process of claim 1 wherein the lactone is ε-caprolactone, the catalyst is a mixture of tetrabutyl dichlorodistannoxate and hexabutyl dichlorotristannoxate and the initiator is dimethyl terephthalate.
Claim 11
Dependent Claim
17 words
The process of claim 9 wherein the molecular weight of the polymer is from 10,000 to 100,000.
Claim 12
Dependent Claim
26 words
The process of claim 1 wherein the lactone is ε-caprolactone, the catalyst is a mixture of tetrabutyl dichlorodistannoxate and hexabutyl dichlorotristannoxate and the initiator is di-(2-ethylhexyl)-adipate.
Claim 13
Dependent Claim
17 words
The process of claim 11 wherein the molecular weight of the polymer is from 10,000 to 100,000.
Claim 14
Dependent Claim
16 words
The process of claim 1 wherein the polymer has a reduced viscosity of at least 0.09.
Claim 15
Dependent Claim
27 words
The process of claim 1 wherein the lactone polymerized is γ-caprolactone, the catalyst is a mixture of tetrabutyl dichlorodistannoxate and hexabutyl dichlorotristannoxate and the initiator is di-(2-ethylhexyl)-adipate.
Claim 16
Dependent Claim
17 words
The process of claim 1 wherein the molecular weight of the polymer is from 10,000 to 100,000.
References Cited (Backward Citations)
GB755447A
Cited
US2890208A
Cited
US3169945A
Cited
US3021316A
Cited
US3021314A
Cited
US3498957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |