Articles comprising isosorbide and processes for their manufacture
AssigneeEastman Chemical Company
InventorRobert Ellis McCrary
Life of this patent
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Abstract
The invention is generally directed to sports bottles and other articles produced by blow molding from polymeric materials containing isosorbide having glass transition temperatures ranging from 90° C. to 130° C., as well as to processes for producing them. These articles can be exposed to water at high temperatures and can be produced by using a suitable combination of a stretch ratio of less than 3× and a preform temperature at least 20° C. greater than the glass transition temperature (Tg) of the polymeric material.
Claims25
A process for making a sports bottle comprising blow molding a preform made from a polymeric material,
- wherein the preform temperature at the time of inflation is at least 20° C. above the Tg temperature of the polymeric material;
- wherein the stretch ratio of the sports bottle with respect to the preform is 2.7× or less;
- wherein the Tg of the polymeric material is from 90° C. to 130° C.;
- wherein the polymeric material is a polyester composition comprising:
- (I) at least one polyester, which comprises
- (a) a dicarboxylic acid component comprising:
- i) 70 to 100 mole % of terephthalic acid residues;
- ii) 0 to 30 mole % of aromatic dicarboxylic acid residues having up to 20 carbon atoms;
- and
- iii) 0 to 10 mole % of aliphatic dicarboxylic acid residues having up to 16 carbon atoms;
- and
- (b) a glycol component comprising:
- i) 5 to 35 mole % of isosorbide residues;
- ii) 40 to 65 mole % of 1,4-cyclohexanedimethanol residues, and
- iii) 20 to 45 mole % of ethlylene glycol residues;
- wherein the total mole % of the dicarboxylic acid component is 100 mole %, and the total mole % of the glycol component is 100 mole %;
- wherein the inherent viscosity of the polyester is from 0.45 to 1.0 dL/g as determined in 60/40 (wt/wt) phenol/tetrachloroethane at a concentration of 0.5 g/100 ml at 25° C.;
- and
- wherein the sports bottle displays shrinkage of 5% or less after immersion in boiling water for one hour.
A process for making a sports bottle comprising blow molding a preform made from a polyester composition,
- wherein the preform temperature at the time of inflation is at least 20° C. above the Tg temperature of the polyester composition;
- wherein the stretch ratio of the sports bottle with respect to the preform is from 1.2× to 2.5×;
- wherein the Tg of the polyester composition is from 95° C. to 125° C.;
- wherein the sports bottle displays shrinkage of 5% or less after immersion in boiling water for one hour;
- wherein the polyester composition comprises:
- (I) at least one polyester, which comprises
- (a) a dicarboxylic acid component comprising:
- i) 70 to 100 mole % of terephthalic acid residues;
- ii) 0 to 30 mole % of aromatic dicarboxylic acid residues having up to 20 carbon atoms;
- and
- iii) 0 to 10 mole % of aliphatic dicarboxylic acid residues having up to 16 carbon atoms;
- and
- (b) a glycol component comprising:
- i) 10 to 30 mole % of isosorbide residues;
- ii) 40 to 65 mole % of 1,4-cyclohexanedimethanol residues, and
- iii) 20 to 40 mole % of ethylene glycol residues,
- wherein the total mole % of the dicarboxylic acid component is 100 mole %, and the total mole % of the glycol component is 100 mole %;
- wherein the inherent viscosity of the polyester is from 0.50 to 0.80 dL/g as determined in 60/40 (wt/wt) phenol/tetrachloroethane at a concentration of 0.5 g/100 ml at 25° C.
Dependencies are inferred from the claim text.