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US 5,696,176 AGranted
Foamable polyester compositions having a low level of unreacted branching agent
AssigneeEastman Chemical Company
InventorsKishan Chand Khemani, Carlos Humberto Juarez-Garcia, Gary Darrel Boone
Life of this patent
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Abstract
This invention relates to a process for preparing foamable branched polyester compositions having increased melt viscosity and melt strength, and a reduced level of unreacted monomeric branching agent. The process involves melt blending (A) a composition containing a polyolefin and branching agent, (B) a nucleating agent either in powder form or (B') in the form of a composition containing a polyolefin and nucleating agent, and a polyester.
Claims25
A process for preparing a foamable branched polyester composition having a reduced level of unreacted monomeric branching agent, comprising melt blending:
- (A) a composition consisting essentially of:
- (1) 50 to 99 weight % of a polyolefin having a repeat unit selected from the group consisting of ethylene, propylene, butene, and combinations thereof, provided the ethylene polymers have a melt index of 0 to 100 at 190.degree. C. as measured by ASTM D1238-56T, and the propylene and butene polymers have a melt flow rate of 0 to 100 at 230.degree. C. as measured by ASTM D1238-56T;
- and
- (2) 1 to 50 weight % of a monomeric branching agent having a molecular weight of 50 to 5000 selected from the group consisting of a carboxylic acid having at least two carboxyl groups, and an anhydride having at least one anhydride group, and combinations thereof, provided a reactive compound of a Group I, II, or III metal is not included in composition (A);
- (B) at least one nucleating agent in powder form;
- and
- (C) a polyester having an inherent viscosity of 0.4 to 1.1 dL/g comprising repeat units from
- (a) a dicarboxylic acid selected from the group consisting of aromatic dicarboxylic acids having 8 to 14 carbon atoms, saturated aliphatic dicarboxylic acids having 4 to 12 carbon atoms, and cycloaliphatic dicarboxylic acids having 8 to 12 carbon atoms, and combinations thereof;
- and
- (b) a diol selected from the group consisting of cycloaliphatic diols having 6 to 20 carbon atoms, aliphatic diols having 3 to 20 carbon atoms, and combinations thereof,
- wherein the foamable branched polyester composition comprises 0.1 to 20 weight % of (A), 0.01 to 10 weight % of (B), 80 to 99.9 weight % of (C), based on the total weight of (A), (B), and (C).
8 more elements
A process for preparing a foamable branched polyester composition having a reduced level of unreacted monomeric branching agent, comprising melt blending:
- (A) a composition consisting essentially of:
- (1) 50 to 99 weight % of a polyolefin having a repeat unit selected from the group consisting of ethylene, propylene, butene, and combinations thereof, provided the ethylene polymers have a melt index of 0 to 100 at 190.degree. C. as measured by ASTM D1238-56T, and the propylene and butene polymers have a melt flow rate of 0 to 100 at 230.degree. C. as measured by ASTM D1238-56T;
- and
- (2) 1 to 50 weight % of a monomeric branching agent having a molecular weight of 50 to 5000 selected from the group consisting of a carboxylic acid having at least two carboxyl groups, and an anhydride having at least one anhydride group, and combinations thereof, provided a reactive compound of a Group I, II, or III metal is not included in composition (A);
- (B) a composition consisting essentially of:
- (3) 50 to 99 weight % of a polyolefin having a repeat unit selected from the group consisting of ethylene, propylene, butene, and combinations thereof, provided the ethylene polymers have a melt index of 0 to 100 at 190.degree. C, and the propylene and butene polymers have a melt flow rate of 0 to 100 at 230.degree. C;
- and
- (4) 1 to 50 weight % of at least one nucleating agent, provided a reactive compound of a Group I, II, or III metal is not included in composition (B');
- and
- (C) a polyester having an inherent viscosity of 0.4 to 1.1 dL/g comprising repeat units from
- (a) a dicarboxylic acid selected from the group consisting of aromatic dicarboxylic acids having 8 to 14 carbon atoms, saturated aliphatic dicarboxylic acids having 4 to 12 carbon atoms, and cycloaliphatic dicarboxylic acids having 8 to 12 carbon atoms, and combinations thereof;
- and
- (b) a diol selected from the group consisting of cycloaliphatic diols having 6 to 20 carbon atoms, aliphatic diols having 3 to 20 carbon atoms, and combinations thereof,
- wherein the foamable branched polyester composition comprises 0.1 to 20 weight % of (A), 0.02 to 20 weight % of (B'), 80 to 99.9 weight % of (C), based on the total weight of (A), (B'), and (C).
11 more elements
A process for preparing a foamable branched polyester composition having a reduced level of unreacted monomeric branching agent, comprising melt blending:
- (A) a composition consisting essentially of:
- (1) 70 to 95 weight % of a polyolefin having a repeat unit selected from the group consisting of ethylene, propylene, butene, and combinations thereof, provided the ethylene polymers have a melt index of 0 to 100 at 190.degree. C. as measured by ASTM D1238-56T, and the propylene and butene polymers have a melt flow rate of 0 to 100 at 230.degree. C. as measured by ASTM D1238-56T;
- and
- (2) 5 to 30 weight % of a monomeric branching agent having a molecular weight of 50 to 5000 selected from the group consisting of a carboxylic acid having at least two carboxyl groups, and an anhydride having at least one anhydride group, and combinations thereof, provided a reactive compound of a Group I, II, or III metal is not included in composition (A);
- (B') a composition consisting essentially of:
- (3) 60 to 80 weight % of a polyolefin having a repeat unit selected from the group consisting of ethylene, propylene, butene, and combinations thereof, provided the ethylene polymers have a melt index of 0 to 100 at 190.degree. C., and the propylene and butene polymers have a melt flow rate of 0 to 100 at 230.degree. C.;
- and
- (4) 20 to 40 weight % of at least one nucleating agent, provided a reactive compound of a Group I, II, or III metal is not included in composition (B');
- and
- (C) a polyester having an inherent viscosity of 0.4 to 1.1 dL/g comprising repeat units from
- (a) a dicarboxylic acid selected from the group consisting of aromatic dicarboxylic acids having 8 to 14 carbon atoms, saturated aliphatic dicarboxylic acids having 4 to 12 carbon atoms, and cycloaliphatic dicarboxylic acids having 8 to 12 carbon atoms, and combinations thereof;
- and
- (b) a diol selected from the group consisting of cycloaliphatic diols having 6 to 20 carbon atoms, aliphatic diols having 3 to 20 carbon atoms, and combinations thereof,
- wherein the foamable branched polyester composition comprises 1 to 10 weight % of (A), 1 to 10 weight % of (B'), 80 to 98 weight % of (C), based on the total weight of (A), (B'), and (C).
11 more elements
Dependencies are inferred from the claim text.