Abstract: A composite air bag assembly door is disclosed, comprising, an outer-surface layer, a flexible polyurethane foam layer, and a structural support. The polyurethane foam used in the door was designed to withstand the high tensile and tear forces generated by deployment of the air bag. The cohesive strength of the form acts as a bonding agent between the surfacing film or film and the structural support or substrate, helping to ensure that the door remains intact.

Abstract: Covered polyurethane foam panels have incorporated in them an adhesion enhancer which is composed of a polyester polyol and a heteric polyether polyol. The polyester polyol is preferably an adduct of adipic acid with ethylene glycol and butanediol. The heteric polyether polyol contains from about 35 weight percent to about 75 weight percent ethylene oxide, the remainder being propylene or butylene oxide and has a functionality from about 2 to about 3.

Abstract: Fibers about micron size in cross-section of certain fluorine-containing polymers can be treated after being deposited as a diaphragm, either during operation or separately before installation, so that they develop a 0.25-millimeter-thick ply on either side of a central body which is substantially different in chemical composition. This yields a diaphragm 1 to 5 millimeters thick which has a Mullen burst strength approximately three to five times greater than that of an untreated diaphragm (20-25 pounds per square inch versus 5 to 7 pounds per square inch) and a remarkably improved service life in the treated diaphragm (200 days and up) in comparison with such untreated diaphragm (30 days or less). Use of a polymer based upon a major proportion of chlorotrifluoroethylene appears to be required. This discovery is economically significant, in that it is an essential element in the technology of the replacement of asbestos diaphragms now used with a synthetic material.

Abstract: Fibers about micron size in cross-section of certain fluorine-containing polymers can be treated after being deposited as a diaphragm, either during operation or separately before installation, so that they develop a 0.25-millimeter-thick ply on either side of a central body which is substantially different in chemical composition. This yields a diaphragm 1 to 5 millimeters thick which has a Mullen burst strength approximately three to five times greater than that of an untreated diaphragm (20-25 pounds per square inch versus 5 to 7 pounds per square inch) and a remarkably improved service life in the treated diaphragm (200 days and up) in comparison with such untreated diaphragm (30 days or less). Use of a polymer based upon a major proportion of chlorotrifluoroethylene appears to be required. This discovery is economically significant, in that it is an essential element in the technology of the replacement of asbestos diaphragms now used with a synthetic material.

Abstract: Synthetic-fiber diaphragms are further improved by incorporating in the diaphragm an effective proportion of a suitable inorganic material such as TiO.sub.2, BaSO.sub.4 or K.sub.2 Ti.sub.8 O.sub.17, which is more hydrophilic than the fluoropolymer forming the diaphragm. This is done either by mixing the inorganic material with the resin before it is made into fiber or by supplying sub-micron-sized particles of the inorganic material, during or even after diaphragm formation. A principal benefit is that this lowers the cell voltage which is required during an initial period (up to about 300 hours) of the operation of a chlor-alkali cell provided with such a diaphragm, making it possible to avoid such drawbacks as suffering an initial period of low production or the necessity of providing external cooling to the cell during such an initial period.