US4003960A
Expired / Lapsed
US
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Block copolymers
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1975-12-22
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Granted: 1977-01-18
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Expires: 1995-12-22
Abstract
Abstract Block copolymer of the structure A-B, wherein: <IMAGE> A is a polylactamic block of recurring units:
Inventors
- 👤 Pierino Radici
- 👤 Gaudenzio Bianchi
- 👤 Daniele Colombo
- 👤 Paolo Colombo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:41
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/38
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
116 words
A block copolymer of the structure A-B wherein: A is a polylactamic block consisting of a chain of recurring units: ##STR5## obtainable from one or more monomeric lactams of the formula ##STR6## wherein PM is a linear polymethylene chain having from 3 to 13 carbon atoms, non substituted or having at least one hydrogen atom replaced by a radical selected in the group consisting of the alkyl, aryl, alkylaryl and cycloalkyl radicals, B is a polyoxymethylene block consisting of recurring units, said block B being present in the copolymer in an amount of at least 2% by weight, and said block A being present in the copolymer in an amount of at least 0.05% by weight.
Claim 2
Dependent Claim
116 words
A block copolymer of the structure A-B wherein: A is a polylactamic block consisting of a chain of recurring units: ##STR5## obtainable from one or more monomeric lactams of the formula ##STR6## wherein PM is a linear polymethylene chain having from 3 to 13 carbon atoms, non substituted or having at least one hydrogen atom replaced by a radical selected in the group consisting of the alkyl, aryl, alkylaryl and cycloalkyl radicals, B is a polyoxymethylene block consisting of recurring units, said block B being present in the copolymer in an amount of at least 2% by weight, and said block A being present in the copolymer in an amount of at least 0.05% by weight.
Claim 3
Dependent Claim
19 words
The block copolymer of claim 1, wherein said block A has a molecular weight of from 1,000 to 50,000.
Claim 4
Dependent Claim
21 words
The block copolymer of claim 1 said lactams are selected in the group consisting of α-pyrrolidone, α-piperidone, ε-caprolactam, ω-enantiolactam and ω-lauryllactam.
Claim 5
Dependent Claim
65 words
A process for preparing the block copolymer of claim 1, which comprises: preparing a polymer A by catalytic polymerization of one or more of said lactam monomers in a first polymerization stage; purifying the resulting polymer A to render it suitable for the subsequent reaction with formaldehyde; preparing the A-B block copolymer in a second polymerization stage by reacting monomeric formaldehyde with said polymer A.
Claim 6
Dependent Claim
62 words
The process of claim 4, wherein said first polymerization stage is carried out in the presence of an anionic catalyst consisting of a derivative of one of said lactams of the formula: ##STR7##wherein PM is the said polymethylene chain, Z is 1 or 2 and Me is selected in the group consisting of alkali metals, alkaline earth metals and quaternary ammonium groups.
Claim 7
Dependent Claim
27 words
The process of claim 5, wherein said catalyst is used in an amount of from 0.1 to 10 moles for each 100 moles of starting lactam monomers.
Claim 8
Dependent Claim
33 words
The process of claim 4 wherein said first polymerization stage is carried out at a temperature of from -30° to 300° C and for a period of from 1 minute to 120 hours.
Claim 9
Dependent Claim
58 words
The process of claim 4 wherein said first polymerization stage is carried out in the presence of a promotor selected in the group consisting of N-acyl lactams, acid chlorides, N-substituted imides, esters of organic acids and isocyanates, said promotor being added in an amount of from 0.1 to 10 moles for each 100 moles of starting lactam monomers.
Claim 10
Dependent Claim
18 words
The process of claim 4, wherein said polymer A is brought to a particulate form during said purification.
Claim 11
Dependent Claim
36 words
The process of claim 4 wherein said monomeric formaldehyde is reacted with said purified A-B copolymer, either dissolved in a solvent or suspended in a diluent, at a temperature of from -70° C to 110° C.
Claim 12
Dependent Claim
22 words
The process of claim 4 wherein said second polymerization stage is carried out at a temperature of from -20° to 80° C.
Claim 13
Dependent Claim
36 words
The process of claim 4 wherein said A-B copolymer is stabilized by converting the terminal hydroxyl group of the block B into a group selected in the class consisting of the ester, ether and urethane groups.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |