Patent US2595001A successfully refreshed from Google Patents.
EP0052946A1
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EP
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Stabilised polyester compositions
Assignee: Imperial Chemical Industries Ltd
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Filing: 1981-10-26
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Granted: —
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Expires: 2001-10-26
Abstract
Abstract Microbiologically produced polymers based on β-hydroxybutyric acid of improved melt stability containing a polyethylenically unsaturated compound containing at least two reactive groups of the formula -CH=CR 1 - in which R, is hydrogen, a lower alkyl or a phenyl radical and in which compound R 1 may differ from one -CH=CR,- group to another with the proviso that where the compound contains only two groups of the formula -CH=CR 1 -, they are not both contained in: groups where R is hydrogen, a lower alkyl, or a phenyl radical. The polyethylenically unsaturated compounds are most effective when used in the presence of free radical generating agents, although thermal and shear induced activation may be employed. Preferred ethylenically unsaturated compounds contain at least two allyl compounds, at least two maleimido groups or at least three groups of formula:
Inventors
- 👤 Terence John Henman
- 👤 Paul Arthur Holmes
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 06:11
CPC Classifications
C; C12; C12P; C12P7/00; C12P7/62; C12P7/625; C08; C08K; C08K5/00; C08K5/0008; C08K5/005; C08K5/02; C08K5/04; C08K5/10; C08K5/16; C08K5/20; C08K5/49
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
106 words
An HB polymer composition characterised in that it contains an HB polymer and a sufficient quantity of a polyethylenically unsaturated compound containing at least two reactive groups of the formula -CH=CR 1 - in which R 1 is hydrogen, a lower alkyl or a phenyl radical and in which compound R 1 may differ from one -CH=CR 1 - group to another with the proviso that where the compound contains only two groups of the formula -CH=CR 1 -, they are not both contained in: groups where R is hydrogen, a lower alkyl, or a phenyl radical to improve the melt stability of the HB polymer.
Claim 2
Dependent Claim
106 words
An HB polymer composition characterised in that it contains an HB polymer and a sufficient quantity of a polyethylenically unsaturated compound containing at least two reactive groups of the formula -CH=CR 1 - in which R 1 is hydrogen, a lower alkyl or a phenyl radical and in which compound R 1 may differ from one -CH=CR 1 - group to another with the proviso that where the compound contains only two groups of the formula -CH=CR 1 -, they are not both contained in: groups where R is hydrogen, a lower alkyl, or a phenyl radical to improve the melt stability of the HB polymer.
Claim 3
Dependent Claim
53 words
An HB polymer composition according to claim 1 in which the polyethylenically unsaturated compound contains at least two groups of the formula: where R and R 1 may be the same or different and are selected from hydrogen, lower alkyl or phenyl radicals and R 2 may be hydrogen or lower alkyl radical.
Claim 4
Dependent Claim
60 words
An HB polymer composition according to claim 1 in which the polyethylenically unsaturated compound contains a single group of the formula: where R and R 1 may be the same or different and are selected from hydrogen, lower alkyl or phenyl radicals and R 2 may be hydrogen or lower alkyl, together with at least one different ethylenically unsaturated group.
Claim 5
Dependent Claim
30 words
An HB polymer composition according to claim 3 in which the polyethylenically unsaturated compound contains at least one group of formula: where R and R 1 are as previously specified.
Claim 6
Dependent Claim
30 words
An HB polymer composition according to claim 1 in which the polyethylenically unsaturated compound contains at least three groups of formula: wherein R and R l are as previously specified.
Claim 7
Dependent Claim
29 words
An HB polymer composition according to claim 1 in which the polyethylenically unsaturated compound contains at least two maleimido groups linked by a divalent aliphatic, aromatic or cycloaliphatic radical.
Claim 8
Dependent Claim
22 words
An HB polymer composition according to either of claims 1 or 2 in which the polyethylenically unsaturated compound is a substituted amide.
Claim 9
Dependent Claim
51 words
An HB polymer composition according to any one of claims 1 to 7 in which the polyethylenically unsaturated compound has a melting point which is within the temperature range from about 20°C less than the melting point of the HB polymer to 20°C above the melting point of the HB polymer.
Claim 10
Dependent Claim
22 words
An HB polymer composition according to any one of claims 1 to 8 in which a free radical generating agent is present.
Claim 11
Dependent Claim
31 words
An HB polymer composition according to any one of the preceding claims in which the composition contains from 0.1 to 10% by weight of the composition of the polyethylenically unsaturated compound.
Claim 12
Dependent Claim
24 words
An HB polymer composition according to claim 9 containing from 0.01 to 2.0% by weight of the composition of a free radical generating agent.
Claim 13
Dependent Claim
96 words
An HB polymer composition which has been prepared by reacting an HB polymer with at least one polyethylenically unsaturated compound containing at least two reactive groups of the formula -CH=CR 1 - in which R 1 is hydrogen, a lower alkyl or a phenyl radical and in which compound R 1 may differ from one -CH=CR 1 - group to another with the proviso that where the compound contains only two groups of the formula -CH=CR 1 -, they are not both contained in: groups where R is hydrogen, a lower alkyl, or a phenyl radical.
Claim 14
Dependent Claim
96 words
An HB polymer composition which has been prepared by reacting an HB polymer with at least one polyethylenically unsaturated compound containing at least two reactive groups of the formula -CH=CR 1 - in which R 1 is hydrogen, a lower alkyl or a phenyl radical and in which compound R 1 may differ from one -CH=CR 1 - group to another with the proviso that where the compound contains only two groups of the formula -CH=CR 1 -, they are not both contained in: groups where R is hydrogen, a lower alkyl, or a phenyl radical.
Claim 15
Dependent Claim
26 words
A polymer composition containing a microbiologically produced HB polymer and having a melt flow time which is at least double that of the HB polymer itself.
Claim 16
Dependent Claim
26 words
A polymer composition containing a microbiologically produced HB polymer and having a melt flow time which is at least double that of the HB polymer itself.
References Cited (Backward Citations)
JPS5273948A
Cited
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