Unlock instant, AI-driven research and patent intelligence for your innovation.

Crystalline polyglycolic acid, polyglycolic acid composition and production process thereof

一种聚乙醇酸、结晶性的技术，应用在控制聚乙醇酸的结晶性领域，能够解决成型品品质下降、聚乙醇酸熔融稳定性降低、聚乙醇酸熔融稳定性不充分等问题

Inactive Publication Date: 2005-04-20
KUREHA KAGAKU KOGYO KK
View PDF11 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, it is known that most additives such as catalyst deactivators, crystal nucleating agents, plasticizers, and antioxidants will reduce the melt stability of polyglycolic acid.
[0015] If the melt stability of polyglycolic acid is insufficient, molding conditions such as molding temperature are limited within a narrow range in molding processes such as injection molding, extrusion molding, and press molding, and the quality of the obtained molded products is also likely to deteriorate.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Crystalline polyglycolic acid, polyglycolic acid composition and production process thereof
  • Crystalline polyglycolic acid, polyglycolic acid composition and production process thereof
  • Crystalline polyglycolic acid, polyglycolic acid composition and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0178] 10 mg of polyglycolic acid synthesized by ring-opening polymerization of glycolide (melting point Tm=222° C., crystal melting entropy=71 J / g) was packed into an aluminum pan, and heated from 50° C. under a nitrogen atmosphere of 50 ml / min. Start heating up to a predetermined temperature at a rate of 10° C. / minute (first heating). Keep at the predetermined temperature for 2 minutes, and then lower the temperature to 50° C. at a rate of 10° C. / minute (first cooling). The melting point Tm is obtained from the endothermic peak caused by crystal melting during the first heating, and the crystallization temperature Tc is obtained from the exothermic peak caused by crystallization during the first cooling. 2 . The crystallization temperature Tc when the predetermined temperature is converted to 240, 250, 260, 270, 280, 290, 300°C 2 and the crystallization peak area to obtain the crystallization entropy (J / g), and all the measurement results including the crystallization entr...

Embodiment 2

[0182] The same polyglycolic acid as in Example 1 was melted at 270° C., and cooled while forming a sheet by water-cooling press. As a result, a transparent sheet can be obtained, which can be stretched.

Embodiment 3

[0186] 10 mg of polyglycolic acid (melting point Tm=222° C., crystal melting entropy=71 J / g) synthesized by ring-opening polymerization of glycolide was put into an aluminum pan, and under a dry nitrogen atmosphere of 50 ml / min, from- From 50°C, the temperature was raised to a predetermined temperature A at a rate of 10°C / min (first heating). Keep at the predetermined temperature for 2 minutes, and then lower the temperature to -50°C at a rate of 10°C / min (first cooling). Again, the temperature was raised from -50°C to the predetermined temperature B at a rate of 10°C / min (second heating). Hold at predetermined temperature B for 2 minutes, then cool down to -50°C at a rate of 10°C / min (second cooling). Experiments were performed by changing the predetermined temperatures A and B of the first heating and the second heating to 250°C and 250°C, 250°C and 280°C, and 280°C and 250°C, respectively.

[0187] The melting point Tm and crystallization temperature Tc of each first heat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
crystallization temperatureaaaaaaaaaa
glass transition temperatureaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

Crystalline polyglycolic acid wherein a difference between the melting point Tm and the crystallization temperature Tc 2 is not lower than 35°C, and a difference between the crystallization temperature Tc 1 and the glass transition temperature Tg is not lower than 40°C. A production process of polyglycolic acid modified in crystallinity, comprising applying heat history to crystalline polyglycolic acid at a temperature of not lower than (the melting point Tm of the crystalline polyglycolic acid + 38°C). A polyglycolic acid composition comprising crystalline polyglycolic acid and a heat stabilizer, wherein a difference (T 2 - T 1 ) between the temperature T 2 at 3%-weight loss on heating of the polyglycolic acid composition and the temperature T 1 at 3%-weight loss on heating of the crystalline polyglycolic acid is not lower than 5°C.

Description

technical field [0001] The present invention relates to polyglycolic acid (including polyglycolide) with improved thermal properties such as crystallinity and a preparation method thereof. The polyglycolic acid of the present invention is excellent in melt processability, stretch processability, etc., and is suitable for use as, for example, sheets, films, fibers, blow moldings, composite materials (multilayer films, multilayer containers, etc.), other Polymer materials such as molded products. [0002] The present invention relates to a polyglycolic acid composition having excellent melt stability and suppressing gas generation caused by low-molecular-weight substances during melting, and a method for producing the same. The present invention further relates to methods of controlling the crystallinity of polyglycolic acid. Background technique [0003] It is known that the molecular chain of polyglycolic acid contains aliphatic ester bonds, so it can be decomposed by micr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B29C49/00B65D1/02C07C59/10C08G63/08C08G63/80C08G63/88C08K5/49C08K5/527
CPCC08G63/08C08G63/80C08G63/88C08K5/527C08L67/04C08G63/06
Inventor 山根和行三浦广光小野利彦中岛顺司伊藤大辅
Owner KUREHA KAGAKU KOGYO KK