US5510401A
Expired / Lapsed
US
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Starch-based composition
Assignee: Solvay SA
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Filing: 1994-04-12
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Granted: 1996-04-23
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Expires: 2014-04-12
Abstract
Abstract The invention relates to an alloy composition possessing improved properties of mechanical resistance. The composition contains a starch, which is preferably plasticised, and a polymer which acts as coupling agent which is chosen from the group consisting of polyolefins modified by chemical functional groups which are active towards the hydroxyl functional groups of starch. Generally, the composition also contains a thermoplastic polymer. The invention also relates to the process for preparing this composition and the use of these compositions for the manufacture of films intended for the paper market and for packages made from biodegradable plastic.
Inventors
- 👤 Claude Dehennau
- 👤 Thierry Depireux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:52
CPC Classifications
C; C08; C08L; C08L3/00; C08L3/02; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L51/00; C08L51/06; C08L23/26
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
75 words
A composition, comprising a starch and a polymer acting as coupling agent which is chosen from the group consisting of polyethylene modified by grafting maleic anhydride, and terpolymers containing units derived from maleic anhydride, the ratio of the dynamic modulus of elasticity G' of said composition to the dissipative modulus G" of said composition, measured at 160° C. and at a frequency of 0.1 rad per s (0.1 s -1 ), being greater than 1.6.
Claim 2
Dependent Claim
75 words
A composition, comprising a starch and a polymer acting as coupling agent which is chosen from the group consisting of polyethylene modified by grafting maleic anhydride, and terpolymers containing units derived from maleic anhydride, the ratio of the dynamic modulus of elasticity G' of said composition to the dissipative modulus G" of said composition, measured at 160° C. and at a frequency of 0.1 rad per s (0.1 s -1 ), being greater than 1.6.
Claim 3
Dependent Claim
14 words
The composition according to claim 1, wherein the G'/G" ratio is greater than 1.7.
Claim 4
Dependent Claim
29 words
The composition according to claim 1, wherein the starch is plasticised with a plasticiser selected from the group consisting of glycerine, diglycerine, polyglycerine, sorbitol, a polyol and mixtures thereof.
Claim 5
Dependent Claim
10 words
The composition according to claim 1, further comprising a polyethylene.
Claim 6
Dependent Claim
14 words
The composition according to claim 1, wherein the starch used is destructurized or pregelatinised.
Claim 7
Dependent Claim
17 words
The composition according to claim 1, wherein the starch contains more than 70% by weight of amylopectin.
Claim 8
Dependent Claim
39 words
The composition according to claim 4, wherein said composition comprises from about 20 to 80% by weight of starch, from about 0 to 70% by weight of polyethylene and from about 1 to 70% by weight of coupling agent.
Claim 9
Dependent Claim
31 words
The composition according to claim 5, wherein the starch used contains up to about 50% by weight of plasticiser expressed relative to the total weight of the starch and the plasticiser.
Claim 10
Dependent Claim
10 words
A biodegradable film comprising a composition according to claim 1.
Claim 11
Dependent Claim
88 words
A process for preparing a composition, comprising starch and a polymer acting as a coupling agent which is chosen from the group consisting of polyethylene modified by grafting maleic anhydride, and terpolymers containing units derived from maleic anhydride, the ratio of the dynamic modulus of elasticity G' of said composition to the dissipative modulus G" of said composition, measured at 160° C. and at a frequency of 0.1 rad per s (G'/G"), being greater than 1.6, said process comprising plasticising a mixture comprising the coupling agent and starch.
Claim 12
Dependent Claim
88 words
A process for preparing a composition, comprising starch and a polymer acting as a coupling agent which is chosen from the group consisting of polyethylene modified by grafting maleic anhydride, and terpolymers containing units derived from maleic anhydride, the ratio of the dynamic modulus of elasticity G' of said composition to the dissipative modulus G" of said composition, measured at 160° C. and at a frequency of 0.1 rad per s (G'/G"), being greater than 1.6, said process comprising plasticising a mixture comprising the coupling agent and starch.
Claim 13
Dependent Claim
15 words
The process according to claim 10, wherein said mixture is plasticised with an inner mixer.
Claim 14
Dependent Claim
16 words
The process according to claim 10, wherein the plasticisation means is a co-rotating twin screw extruder.
Claim 15
Dependent Claim
21 words
The process according to claim 10, wherein a mixture is used which comprises a plasticised starch compound and a coupling agent.
Claim 16
Dependent Claim
25 words
The process according to claim 10, wherein a mixture is used which comprises a native, pregelatinised or modified starch, a plasticiser and a coupling agent.
Claim 17
Dependent Claim
14 words
A process for preparing a biodegradable film, comprising the process defined in claim 10.
Claim 18
Dependent Claim
56 words
A composition, comprising a starch and a polymer acting as coupling agent, selected from the group consisting of polyethylene modified by grafting maleic anhydride, and terpolymers containing units derived from maleic anhydride, the ratio of the dynamic modulus of elasticity G' of said composition to the dissipative modulus G" of said composition being greater than 1.6.
Claim 19
Dependent Claim
56 words
A composition, comprising a starch and a polymer acting as coupling agent, selected from the group consisting of polyethylene modified by grafting maleic anhydride, and terpolymers containing units derived from maleic anhydride, the ratio of the dynamic modulus of elasticity G' of said composition to the dissipative modulus G" of said composition being greater than 1.6.
Claim 20
Dependent Claim
72 words
A process for preparing a composition comprising starch and a polymer acting as a coupling agent, selected from the group consisting of ethylene modified by grafting maleic anhydride, and terpolymers containing units derived from maleic anhydride, the ratio of a dynamic modulus of elasticity G' of said composition to the dissipative modulus G" of said composition being greater than 1.6, said process comprising plasticising a mixture comprising the starch and coupling agent.
Claim 21
Dependent Claim
72 words
A process for preparing a composition comprising starch and a polymer acting as a coupling agent, selected from the group consisting of ethylene modified by grafting maleic anhydride, and terpolymers containing units derived from maleic anhydride, the ratio of a dynamic modulus of elasticity G' of said composition to the dissipative modulus G" of said composition being greater than 1.6, said process comprising plasticising a mixture comprising the starch and coupling agent.
Claim 22
Dependent Claim
15 words
The process according to claim 17, wherein said mixture is plasticised with an inner mixer.
References Cited (Backward Citations)
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