Abstract:
A plastic lens composition having a low viscosity, a plastic lens by curing the composition, and a method for producing the plastic lens are disclosed. The plastic lens composition contains a bromine-containing (meth)allyl ester-based compound and exhibits low viscosity and the cured composition has a high refractive index of 1.58 or more and a low specific gravity of 1.40 or less.
Abstract:
A method of production of an ether compound from an acetal compound or a ketal compound which is excellent in conversion and selectivity and does not cause corrosion of apparatuses and a novel useful polyvinyl ether compound as lubricating oil for compression-type refrigerators, electric insulation oil and the like are disclosed. The method of production of the present invention comprises reaction of an acetal compound or a ketal compound with hydrogen in the presence of a solid catalyst having acidic property and hydrogenation ability to produce the corresponding ether compound. The polyvinyl ether compound of the present invention comprises the constituting unit expressed by the general formula: ##STR1## (characters in the general formula are the same as those described in the specification), contains none of unsaturated bond, acetal structure and aldehyde structure in the molecule and has weight average molecular weight in the range of 300 to 3000.
Abstract:
[Object] To provide a method for producing a vinyl ether polymer containing a hydrocarbon group in a stable and efficient manner, wherein decomposition of the monomer and generation of polyacetal are suppressed. [Means for solving problem] The method for producing a vinyl ether polymer containing a hydrocarbon group according to the present invention comprises the step of polymerizing vinyl ether represented by the following formula (1):
wherein R1 represents an aliphatic hydrocarbon group having 1 to 10 carbons or an alicyclic hydrocarbon group having 3 to 10 carbons,
in the presence of water as a polymerization solvent and an organic azo-based compound as a radical polymerization initiator, under pH of 6 or more.
Abstract:
A process is disclosed for the preparation of liquid and aqueous solutions of amorphous colorless poly (vinyl methyl ether) polymer with low level of impurities from purified vinyl methyl ether. The polymer has relatively high molecular weight, narrow molecular weight distribution and does not degrade readily due to the presence of impurities. The purification of the monomer uses a procedure selected from the group consisting of a vapor-liquid separation, a solid-liquid separation and combinations thereof to remove the impurities at a temperature within the range of from -20.degree. C. to +30.degree. C. The aqueous solution is prepared by devolitilization of solvent solutions of the polymerized purified vinyl methyl ether monomer. The solid polymer is prepared by heating the aqueous solution of the poly(vinyl methyl ether). The amorphous polymers of poly(vinyl methyl ether) are particularly suited for adhesive applications.
Abstract:
This invention relates to a process for the living cationic polymerization of vinylic unsaturated compounds containing electron donating substituents resulting in polymers of narrow molecular weight distribution.
Abstract:
Disclosed herein are isotactic polyvinyl ethers and improved methods of making same. The method disclosed herein can produce polyvinyl ethers having a higher isotacticity as compared to polyvinyl ethers prepared with conventional methods.
Abstract:
A lubricating oil for compression-type refrigerators which comprises as the main component thereof a polyvinyl ether compound having excellent compatibility with a hydrofluorocarbon or a hydrochlorofluorocarbon, such as 1,1,1,2-tetrafluoroethane and the like, which can be used as the refrigerant to replace compounds causing environmental pollution, such as dichlorofluoroethane and the like, and having an excellent lubricating property is disclosed. The lubricating oil for compression-type refrigerators comprises as the main component thereof a polyvinyl ether compound having the constituting units expressed by the general formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 are H or a hydrocarbon group of C.sub.1.about.8, R.sup.4 is a bivalent hydrocarbon group of C.sub.2.about.10, R.sup.5 is a hydrocarbon group of C.sub.1.about.10 and m is 0.about.10.
Abstract:
A plastic lens composition having a low viscosity and capable of yielding a cured material having a high refractive index and a small specific gravity, a plastic lens by curing the composition, and a method for producing the plastic lens. A plastic lens composition containing a bromine-containing (meth)allyl ester-based compound is low in viscosity as compared with conventional plastic lens compositions and a cured material of the composition has a high refractive index and a low specific gravity.
Abstract:
A method of production of polyvinyl ether compound by which the polyvinyl ether compound having a desired degree of polymerization is produced reliably, safely and efficiently and a novel polyvinyl ether compound useful as lubricating oil for compression-type refrigerators, electric insulation oil and the like are disclosed. The method of production of the present invention is a method of producing a polyvinyl ether compound which comprises polymerizing a vinyl ether compound in the presence of a Lewis acid catalyst and a specific acetal or a method of producing a polyvinyl ether compound which comprises forming an acetal by reaction of a vinyl ether compound with a specific alcohol in the presence of a Lewis acid catalyst, then adding the vinyl ether compound to the acetal and polymerizing the vinyl ether compound. The polyvinyl ether compound of the present invention is homopolymer or a copolymer of an alkyl vinyl ether comprising the constituting unit expressed by the general formula: ##STR1## (R.sup.15 : an alkyl group of C.sub.1 .about.C.sub.3) and having weight average molecular weight of 300 to 1200 and one end having a specific structure.