Fibrous polyacrylonitrile reinforcing mixture for friction product applications, and method of making same
US4886706A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1987 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | Mar 11, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249924
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An improved fibrous polyacrylonitrile mixture for use in friction products enables the production of low resiliency preforms by mixing an additive with a polyacrylonitrile wet gel. The additive is incorporated into the fiber in extremely large amounts. The additive is a member selected from the group consisting of: PA0 (a) polyethylene glycol esters of pelargonic acid; or PA0 (b) polyethylene glycol esters of enanthic, caprylic or capric acids; or PA0 (c) blends of polyethylene glycol esters of enanthic, caprylic, pelargonic, or capric acids; or PA0 (d) blends of polyethylene glycol esters of carboxylic acids derived from natural products containing at least 50% by weight of carboxylic acids containing less than 14 carbon atoms; or PA0 (e) reaction products of ethylene oxide and carboxylic acid amides wherein at least 70% of the acids from which the amide is derived contain between 16 and 20 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.