Resin composition and method for determining flame retardancy of resin composition

Patent metadata

Field	Value
Publication number	US-11492485-B2
Application number	US-201816497506-A
Country	US
Kind code	B2
Filing date	Mar 26, 2018
Priority date	Mar 27, 2017
Publication date	Nov 8, 2022
Grant date	Nov 8, 2022

Abstract

There are provided a resin composition that is suitable for the production of a flame-retardant molded article and that can provide high flame retardancy even with a small amount of flame retardant added, and a flame retardancy determination method for determining the flame retardancy of a resin composition. The resin composition of the present invention contains a thermoplastic resin, a cellulosic material, and a phosphate flame retardant and satisfies relational expressions (1) and (2) (where in expressions (1) and (2), TP, TB, and TCMP are temperatures at weight loss rate peaks in thermogravimetric analysis, TP is a temperature (° C.) at a weight loss rate peak of the thermoplastic resin, TB is a temperature (° C.) at a weight loss rate peak of the cellulosic material, and TCMP is a temperature (° C.) at a weight loss rate peak of the resin composition. When the resin composition has two weight loss rate peaks, TCMP is a temperature at a peak on a lower temperature side).

First claim

The invention claimed is:

1. A resin composition comprising a thermoplastic resin, a cellulosic material consisting only of cellulose powder, and a phosphate-based flame retardant, the resin composition satisfying relational expressions (1) and (2) described below:
[Math. 1]
T P −T CMP ≥95  (1)

[Math. 2]
T P >T B   (2)

wherein, in expressions (1) and (2), T P , T B , and T CMP are temperatures at weight loss rate peaks in thermogravimetric analysis, T P is a temperature (° C.) at a weight loss rate peak of the thermoplastic resin, T B is a temperature (° C.) at a weight loss rate peak of the cellulosic material, and T CMP is a temperature (° C.) at a weight loss rate peak of the resin composition,
wherein, when the resin composition has two weight loss rate peaks, T CMP is a temperature at a peak on a lower temperature side,
wherein the proportion of the flame retardant contained is 5% to 15% by weight per a total amount of the resin composition,
wherein the thermoplastic resin is polyolefin, and
wherein the cellulose powder has a particle size of 150 μm or less.

2. The resin composition according to claim 1 , wherein only the phosphate-based flame retardant is contained as a flame retardant.

3. The resin composition according to claim 1 , wherein the phosphate-based flame retardant is ammonium polyphosphate and/or melamine phosphate.

4. The resin composition according to claim 1 , wherein the proportion of the flame retardant contained is 5% to 10% by weight per a total amount of the resin composition.

5. A resin composition comprising a thermoplastic resin, a cellulosic material consisting only of cellulose, and a phosphate-based flame retardant, the resin composition satisfying relational expressions (1) and (2) described below:
[Math. 1]
T P −T CMP ≥95  (1)

[Math. 2]
T P >T B   (2)

wherein, in expressions (1) and (2), T P , T B , and T CMP are temperatures at weight loss rate peaks in thermogravimetric analysis, T P is a temperature (° C.) at a weight loss rate peak of the thermoplastic resin, T B is a temperature (° C.) at a weight loss rate peak of the cellulosic material, and T CMP is a temperature (° C.) at a weight loss rate peak of the resin composition,
wherein, when the resin composition has two weight loss rate peaks, T CMP is a temperature at a peak on a lower temperature side,
wherein the thermoplastic resin is polyester,
wherein the proportion of the flame retardant contained is 5% to 15% by weight per a total amount of the resin composition,
wherein the proportion of the cellulosic material is more than 30% by weight and less than 70% by weight per a total amount of the resin composition,
wherein the proportion of the cellulosic material is three to four times of the proportion of the flame retardant, and
wherein the phosphate-based flame retardant is ammonium polyphosphate and/or melamine phosphate.

6. The resin composition according to claim 5 , wherein only the phosphate-based flame retardant is contained as a flame retardant.

7. The resin composition according to claim 5 , wherein the polyester is poly(lactic acid).

8. The resin composition according to claim 5 , wherein the proportion of the flame retardant contained is 5% to 10% by weight per a total amount of the resin composition.

9. The resin composition according to claim 5 , wherein the cellulose is cellulose powder having a particle size of 150 μm or less.

10. A resin composition comprising a thermoplastic resin, a cellulosic material consisting only of cellulose powder, and a phosphate-based flame retardant, the resin composition satisfying relational expressions (1) and (2) described below:
[Math. 1]
T P −T CMP ≥95  (1)

[Math. 2]
T P >T B   (2)

wherein, in expressions (1) and (2), T P , T B , and T CMP are temperatures at weight loss rate peaks in thermogravimetric analysis, T P is a temperature (° C.) at a weight loss rate peak of the thermoplastic resin, T B is a temperature (° C.) at a weight loss rate peak of the cellulosic material, and T CMP is a temperature (° C.) at a weight loss rate peak of the resin composition,
wherein, when the resin composition has two weight loss rate peaks, T CMP is a temperature at a peak on a lower temperature side,
wherein the proportion of the flame retardant contained is 5% to 15% by weight per a total amount of the resin composition,
wherein the proportion of the cellulosic material is more than 40% by weight and less than 70% by weight per a total amount of the resin composition,
wherein the proportion of the cellulosic material is three to four times of the proportion of the flame retardant,
wherein the phosphate-based flame retardant is ammonium polyphosphate and/or melamine phosphate, and
wherein the cellulose powder has a particle size of 150 μm or less.

11. The resin composition according to claim 10 , wherein only the phosphate-based flame retardant is contained as a flame retardant.

12. The resin composition according to claim 10 , wherein the thermoplastic resin is polyolefin.

13. The resin composition according to claim 10 , wherein the thermoplastic resin is polyester.

14. The resin composition according to claim 13 , wherein the polyester is poly(lactic acid).

15. The resin composition according to claim 10 , wherein the proportion of the flame retardant contained is 5% to 10% by weight per a total amount of the resin composition.

Assignees

• The Doshisha

Inventors

• Tanaka Tatsuya
• Sano Yukinori
• Masuyama Kenta

Classifications

• C08L1/02 Primary

  Cellulose; Modified cellulose · CPC title

• C08L23/00

  Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers · CPC title

• C08L67/04 Primary

  Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence) · CPC title

• C08L2201/02

  Flame or fire retardant/resistant · CPC title

• C08L101/00

  Compositions of unspecified macromolecular compounds · CPC title