Polyester resin composition and method for manufacturing a high-density tableware article

• US 10,961,386 B2
• Filed: 03/13/2019
• Issued: 03/30/2021
• Est. Priority Date: 10/29/2018
• Status: Active Grant

• Current Assignee: NAN YA Plastics Corporation
• Original Assignee: NAN YA Plastics Corporation
• Inventors: Lin, Fong-Chin, Su, Tzong-Yang
• Primary Examiner(s): Chin, Hui H
• Application Number:
  US16/351,627
• Publication Number:
  US 20200131360A1
• Time in Patent Office: 748 Days
• Field of Search: 524423
• CPC Class Codes: B29C 48/0022 combined with cutting
• CPC Class Codes: B29C 48/04 Particle-shaped making granules B29B9/00
• CPC Class Codes: B29C 48/40 using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
• CPC Class Codes: C04B 14/042 Magnesium silicates, e.g. talc, sepiolite
• CPC Class Codes: C04B 14/043 Alkaline-earth metal silicates, e.g. wollastonite
• CPC Class Codes: C04B 14/368 Baryte
• CPC Class Codes: C04B 18/022 agglomerated by an organic binder
• CPC Class Codes: C04B 2111/00965 for household applications, e.g. use of materials as cooking ware
• CPC Class Codes: C04B 26/18 Polyesters; Polycarbonates
• CPC Class Codes: C04B 40/0222 Irradiation, i.e. gamma -, X -, UV rays
• CPC Class Codes: C04B 40/0263 Hardening promoted by a rise in temperature C04B40/024 takes precedence
• CPC Class Codes: C08J 3/12 Powdering or granulating
• CPC Class Codes: C08K 2003/3045 Sulfates
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08K 3/30 Sulfur-, selenium- or tellurium-containing compounds
• CPC Class Codes: C08K 3/34 Silicon-containing compounds
• CPC Class Codes: C08L 2205/025 containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence

Abstract

A method for manufacturing a high-density tableware article includes the following steps. The first step is providing a polyester resin composition including 45 to 78% by weight of a blend resin and 20 to 50% by weight of an inorganic filler. The blend resin includes PET resin and PBT resin and the content ratio of PET resin to PBT resin in the blended resin by weight is from 1:0.86 to 1:4.8. The next step is granulating the polyester resin composition to produce plastic granules. The final step is molding the plastic granules into a tableware article.

Claims

1. A method for manufacturing a tableware article, comprising:

providing a polyester resin composition including 45 to 78% by weight of a blend resin and 20 to 50% by weight of at least one inorganic filler, wherein the blend resin includes PET resin and PBT resin that are present in a content ratio by weight from 1;

0.86 to 1;

4.8, the at least one inorganic filler includes barium sulfate and calcium silicate, and the content ratio of the barium sulfate to the calcium silicate by weight is from 1;

0.28 to 1;

1.67;

granulating the polyester resin composition to produce plastic granules; and

molding the plastic granules into a tableware article.

2. The method according to claim 1, wherein in the step of granulating the polyester resin composition, the polyester resin composition is added to a twin-screw extruder and melted at a temperature between 250°

C. and 280°

C. for granulation.

3. The method according to claim 1, further comprising:

post-crystallizing the tableware article after the step of molding the plastic granules into the tableware article.

4. The method according to claim 3, wherein the step of post-crystallizing the tableware article includes heat-treating the tableware article being subjected to heat treatment at a temperature between 150°

C. and 200°

C.

5. The method according to claim 4, wherein the tableware article is subjected to heat treatment for a period of time between 10 minutes and 30 minutes.

6. The method according to claim 3, wherein the step of post-crystallizing the tableware article includes irradiating the tableware article with infrared rays.

7. The method according to claim 6, wherein the tableware article is irradiated by the infrared rays for a period of time between 10 minutes and 20 minutes.

8. The method according to claim 1, wherein the polyester resin composition further includes 1 to 10% by weight of at least one additive selected from one or a combination of two of a lubricant, a stabilizer, and a coloring agent.

9. A polyester resin composition for manufacturing a tableware article, comprising:

45 to 78% by weight of a blend resin, wherein the blend resin includes PET resin and PBT resin and the content ratio of PET resin to PBT resin in the blended resin by weight is from 1;

0.86 to 1;

4.8; and

20 to 50% by weight of at least one inorganic filler;

wherein the at least one inorganic filler includes barium sulfate and calcium silicate, and the content ratio of barium sulfate to calcium citrate by weight is from 1;

0.28 to 1;

1.67.