Patent · US Expired

Polyoxymethylene fibrids, a process for their production and their use

US4493751A · kind A · utility

36Cited by

2References

6Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Harald Cherdron · Niedernhausen, DE
Wolfgang Gordon · Hofheim, DE
Friedrich Kloos · Mainz, DE

Key dates

Filing date	Sep 9, 1982
Grant date	Jan 15, 1985
Priority date	—
Expiry date	Sep 9, 2002

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/298
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

The invention relates to polyoxymethylene fibrids with a reduced specific viscosity of 0.4 to 2.0 dl/g, a specific surface area of 50 to 200 m.sup.2 /g and a freeness of 30.degree. to 80.degree. SR. The fibrids are produced by flash-evaporation of a superheated solution of the polymer, a mixture of 50-95% by weight of a lower alcohol with 1-4 C atoms and 5-50% by weight of water being used as the solvent and are suitable for the production of paper.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.