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US 8,273,850 B2Granted
Polyester compositions from biologically-derived materials
AssigneeE. I. Du Pont de Nemours and Company
InventorRameshchandra M. Gohil
Life of this patent
Estimating the term…
Abstract
Polyester compositions based on 1,3-propanediol and aromatic and aliphatic diacids that can contain a large fraction of biologically derived content are disclosed. Transesterification between polyesters in blends of such compositions is greatly reduced using phosphorous-containing additives. The blends have properties similar to poly(ethylene terephthalate).
Claims19
A composition comprising:
- (a) a resin comprising a phase-separated, physical blend of:
- (i) from about 1 to about 99 wt % of a first polyester component selected from the group consisting of:
- poly(trimethylene-2,6-naphthalate);
- at least one polyester based on 1,3-propanediol, 2,6-naphthalene dicarboxylic acid or acid equivalent, and at least one C4 to C12 aliphatic dicarboxylic acid or acid equivalent, in a molar ratio of 50:
- 45-47:
- 3-5;
- and
- mixtures thereof;
- and
- (ii) from about 99 to 1 wt % of a second polyester component, which is at least one polyester based on 1,3-propanediol, terephthalic acid or acid equivalent, and at least one C4 to C12 aliphatic dicarboxylic acid or acid equivalent in a molar ratio of 50:
- 40-25:
- 10-25;
- and
- (b) a phosphorus-containing stabilizer at a concentration of about 0.3 to about 1 wt % based on the combined weight of the resin and the phosphorus-containing stabilizer,
- wherein a differential scanning calorimetry (DSC) scan of the composition shows multiple glass transition temperatures (Tg), each Tg being characteristic of the individual polyester components of the composition.
12 more elements
Dependencies are inferred from the claim text.