Method for molding a polymer composition

Patent metadata

Field	Value
Publication number	US-10493682-B2
Application number	US-201615382147-A
Country	US
Kind code	B2
Filing date	Dec 16, 2016
Priority date	Dec 31, 2015
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A method for molding a polymer composition comprises the steps of (a) providing an apparatus comprising a die and a mold cavity, (b) providing a polymer composition, (c) heating the polymer composition to a temperature sufficient to melt the polymer composition, (d) extruding the molten polymer composition through the die to form a parison, (e) capturing the parison in the mold cavity, (f) blowing a pressurized fluid into the parison, (g) allowing the molded article to cool, and (h) removing the molded article from the mold cavity.

First claim

What is claimed is:

1. A method for molding a polymer composition, the method comprising the steps of:
(a) providing an apparatus comprising a die and a mold cavity, the mold cavity having an interior surface defining a shape for a molded article;
(b) providing a polymer composition comprising (i) a thermoplastic polymer and (ii) 1,3:2,4-bis-O-[(3,4-dichlorophenyl)methylene]-D-glucitol;
(c) heating the polymer composition to a temperature sufficient to melt the polymer composition so that it may be extruded through the die;
(d) extruding the molten polymer composition through the die to form a parison at a temperature of 200° C. or less;
(e) capturing the parison in the mold cavity;
(f) blowing a pressurized fluid into the parison under sufficient pressure to inflate the parison so that it conforms to the interior surface of the mold cavity and produces a molded article;
(g) allowing the molded article to cool to a temperature at which the polymer composition at least partially solidifies so that the molded article retains its shape; and
(h) removing the molded article from the mold cavity.

2. The method of claim 1 , wherein the 1,3:2,4-bis-O-[(3,4-dichlorophenyl)methylene]-D-glucitol is present in the polymer composition in an amount of about 250 ppm to about 3,000 ppm.

3. The method of claim 2 , wherein the 1,3:2,4-bis-O-[(3,4-dichlorophenyl)methylene]-D-glucitol is present in the polymer composition in an amount of about 500 ppm to about 2,000 ppm.

4. The method of claim 1 , wherein the polymer composition further comprises 1,3:2,4-bis-O-[(3,4-dimethylphenyl)methylene]-D-glucitol.

5. The method of claim 4 , wherein the 1,3:2,4-bis-O-[(3,4-dichlorophenyl)methylene]-D-glucitol and 1,3:2,4-bis-O-[(3,4-dimethylphenyl)methylene]-D-glucitol are present in the polymer composition in a ratio of about 9:1 to about 1:9.

6. The method of claim 4 , wherein the total amount of 1,3:2,4-bis-O-[(3,4-dichlorophenyl)methylene]-D-glucitol and 1,3:2,4-bis-O-[(3,4-dimethylphenyl)methylene]-D-glucitol present in the polymer composition is about 250 ppm to about 3,000 ppm.

7. The method of claim 6 , wherein the total amount of 1,3:2,4-bis-O-[(3,4-dichlorophenyl)methylene]-D-glucitol and 1,3:2,4-bis-O-[(3,4-dimethylphenyl)methylene]-D-glucitol present in the polymer composition is about 500 ppm to about 2,000 ppm.

Assignees

• Milliken & Co

Inventors

• Mehl Nathan A

Classifications

• B29K2065/00

  Use of polyphenylenes or polyxylylenes as moulding material · CPC title

• C08K5/053

  Polyhydroxylic alcohols · CPC title

• B29L2031/7158

  Bottles · CPC title

• C08K5/06

  Ethers; Acetals; Ketals; Ortho-esters · CPC title

• B29K2023/12

  PP, i.e. polypropylene · CPC title