Supercharge Your Innovation With Domain-Expert AI Agents!

Oxymethylene polymers, method for the production thereof, and use of same

A formaldehyde polymer and formaldehyde technology, applied in the field of new formaldehyde polymers, can solve the problem of limited polymer yield

Inactive Publication Date: 2013-07-10
TICONA GMBH
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, side reactions proceed to a greater extent and polymer yields in the production are limited

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
  • Oxymethylene polymers, method for the production thereof, and use of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 (according to the present invention)

[0038] The polymerization was carried out in a gas-tight, pressure-stabilized twin-screw extruder with 7 individually adjustable heating stages (=zones 1-7) of approximately equal length. The starting compounds are metered in by means of an HPLC pump and mixed efficiently in a premixing zone by static mixing elements before they are fed into an extruder for polymerization. The passivating agent used was a mixture of 0.2% by weight of triethylamine in 1,3-dioxolane. This solution was metered between zones 5 and 6 at a delivery rate of 40 g / h.

[0039] Preheat 4kg / h to 80℃ Alkanes and 4 g / h of methylal in which 300 ppm trifluoromethanesulfonic acid and 600 ppm triethylammonium hydrogentrifluoromethanesulfonate had been dissolved were pumped into the extruder at a shaft speed of 120 rpm. The pressure was kept constant at 18 bar by a pressure regulator valve at the end of the extruder. The temperature of each heating ...

Embodiment 5

[0050] Example 5: Separation of low molecular weight components from oxymethylene polymers

[0051] 4 g of an oxymethylene polymer having a melt index MVR of 2.5 ml / 10 min and a proportion of the low molecular weight fraction of 10% by weight were placed in an autoclave in 40 g of a mixture of 85% by weight methanol, 15% by weight water and 500 ppm triethylamine Heat with stirring for 10 min to 170 °C. After cooling to room temperature (without stirring), the upper cloudy liquid was separated from the coarse polymer particles at the bottom by brief decantation. After drying, the coarse polymer particles had a weight of 3.4 g and a low molecular weight fraction of 5% by weight.

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
molecular weightaaaaaaaaaa
Login to View More

Abstract

Oxymethylene polymers having a bimodal distribution or having a distribution of higher modality and having a targeted content of a low molecular weight fraction of from 1 to 5 percent by mass are described. Moldings of these polymers are distinguished by high low-temperature notched impact strength associated with a high modulus of elasticity.

Description

technical field [0001] The present invention relates to novel oxymethylene polymers for the production of moldings having excellent low-temperature notched impact strength and high modulus of elasticity, their use and a process for the preparation of the oxymethylene polymers. Background technique [0002] Oxymethylene polymers are obtainable by anionic polymerization of formaldehyde. In order to ensure the thermal stability of the polymers required for practical use, the polymers obtained are terminated by stabilizing end groups, for example by introducing ether or ester end groups. Examples thereof are found in DE-AS-1,158,709, US-A-3,998,791, US-A-3,393,179, DE-A-1,445,255, DE-AS-1,158,709, US-A-4,097,453 and US-A-3,161,616. [0003] While oxymethylene polymers terminated with ester end groups degrade at elevated temperatures or in alkaline environments, oxymethylene polymers terminated with ether end groups exhibit higher chemical stability. However, the processes prop...

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 Patents(China)
IPC IPC(8): C08G2/08C08G2/10C08G2/28C08G2/30C08G2/34C08L59/02C08L59/04C08G2/24
CPCC08L59/04C08G2/34C08G2/24C08G2/04C08L59/02C08L2666/16
Inventor M·豪布斯M·霍夫莫克尔J·林瑙H·勒舍特R·格罗纳
Owner TICONA GMBH
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com