摘要:
High molecular fluoroelastomers are thermally modified by heating the fluoroelastomer at its thermally degradable temperature in the presence of oxygen under maintaining elasticity. The modified fluoroelastomers have the improved adhesiveness and processability and are easily vulcanized.
摘要:
A process for forming a glass sheet, which is a process for continuously forming a glass sheet, and which comprises a step of introducing a vapor film-forming agent, which is not vapor at least around room temperature and which is vapor at a temperature above the glass transition point of the glass, into a support composed of a structure or a material capable of internally containing liquid, and a step of sliding the support and the glass of which temperature is above the glass transition point against each other via a thin layer of a vaporized vapor film-forming agent.
摘要:
A propylene-tetrafluoroethylene copolymer is produced by copolymerizing propylene and tetrafluoroethylene in a molar ratio ranging from 95/5 to 40/60 in an aqueous medium containing tertiary butanol ranging from 5 to 30 wt.%, an emulsifier ranging from 0.01 to 10 wt.% and a redox catalyst of a combination of (1) a water soluble persulfate, (2) a water soluble iron salt, (3) a hydroxymethanesulfinate and (4) ethylenediaminetetraacetic acid or a salt thereof at pH of 8 to 10.5 and at a temperature of 0.degree. to 50.degree. C.
摘要:
A copolymer for a fluorine-containing elastomer having excellent low temperature resistance and alcohol resistance comprises vinylidene fluoride units and fluorovinyl ether units having the formula CF.sub.2 =CFOX (X represents a C.sub.3 -C.sub.9 perfluoroalkyl group which has ether bond having 1-3 oxygen atom) at a molar ratio of vinylidene fluoride units to fluorovinyl ether units of 95:5 to 50:50 and at a total content of the units of at least 80 mole %.
摘要:
A polytetrafluoroethylene resin comprising polytetrafluoroethylene having a two-dimensional branched structure in the molecule is produced by exposing polytetrafluoroethylene to an ionizing radiation at a dose of no more than 10 kGy.
摘要:
A fluorine-containing elastomer having excellent low temperature resistance and oil resistance comprises ethylene units (E) and fluorovinyl ether units (FV) having the formula CF.sub.2 .dbd.CFOX (X represents a C.sub.1 -C.sub.9 perfluoroalkyl group which can have one or more ether bond) at a molar ratio of (E) to (FV) of 95:5 to 30:70 and at a total content of (E) and (FV) of at least 70 mole %.
摘要:
A curable composition comprising an elastomeric vinylidene fluoride copolymer, an organic peroxide and a vulcanization accelerator, characterized in that said copolymer contains unsaturated bonds introduced by reacting an untreated elastomeric vinylidene fluoride copolymer dispersed in an aqueous medium, with an aqueous alkaline solution containing an onium compound.
摘要:
A polytetrafluoroethylene resin comprising polytetrafluoroethylene having a two-dimensional branched structure in the molecule is produced by exposing polytetrafluoroethylene to an ionizing radiation at a dose of no more than 10 kGy.
摘要:
Proposed is a manufacturing method to continuously fabricate plate glass which comprises supporting at least bottom surface of the traveling glass before stiffening by means of a gas generated from support members and controlling the gravitational effect on the glass to provide the partial displacement and deformation repeatedly while changing the position thereof so as to achieve propagation of overall glass extension.The proposed technology shows the possible way to solve or improve the drawbacks and restrictions of known technologies and provides convenient process which may significantly save energy and resource consumption alleviating environmental problems. The technology also realizes plate glass product of high-quality without surface defects and further makes clear the important technical perspectives and essential elements which the former technologies using water vapor thin film basically lack. As a consequence, the invention proposes a novel technology which provides high-quality plate glass having superior microscopic smoothness as well as macroscopic thickness uniformity and surface flatness through realizing the plate glass fabrication method which utilizes broader variety of gasses.
摘要:
A copolymer for an fluorine-containing elastomer having excellent low temperature resistance and alcohol resistance comprises vinylidene fluoride units and fluorovinyl ether units having the formula CF.sub.2 =CFOX (X represents a C.sub.3 -C.sub.9 perfluoroalkyl group which has ether bond having 1-3 oxygen atom) at a molar ratio of vinylidene fluoride units to fluorovinyl ether units of 95:5 to 50:50 and at a total content of the units of at least 80 mole %.