Mitsubishi Rayon Company, Limited

Hisao Anzai

Isao Sasaki

Kozi Nishida

Hideaki Makino

Masaru Morimoto

Toru Maeda

Kazushi Shimada

Masami Ohtani

Katsuhiko Shimada

Nobuyuki Yamamoto

Takashi Kaneko

Kenichi Sakunaga

Masaharu Fujimoto

Yoshitaka Imai

Kazuya Chimura

Ryuichi Nakazono

Kazunori Kagawa

Yasuhiko Iwaoka

Shunichi Takashima

Masao Kawashima

Kenji Tamura

Kenji Takoi

Hiroyuki Ota

Tsutomu Daiguuji

Youichi Kodama

Tamotu Nishizawa

Masami Ootani

Yositaka Sasaki

Takehiko Narisada

A light-transmitting plastic fiber comprising, as a core component, a methacrylimide group-containing polymer prepared by polymerizing methyl methacrylate in the absence of a chain transfer agent and then imidizing the methyl methacrylate polymer thus prepared, and another polymer as a sheath component.

Light-transmitting fiber

Flameresisting apparatus

Disclosed is a thermoplastic methacrylimide-containing polymer comprising 2 to 100% by weight of structural units represented by the following formula (I): ##STR1## wherein R is hydrogen or a hydrocarbon group having 1 to 20 carbon atoms, and 0 to 98% by weight of structural units derived from an ethylenically unsaturated monomer, wherein the number of fine particles having a size of 0.5 to 25 .mu.m as measured by a particle counter in the polymer is not more than 50,000 per gram of the polymer.

Methacrylimide-containing polymer

A thermoplastic methacrylimide-containing polymer comprising 2 to 100% by weight of structural units represented by the following formula (I): ##STR1## wherein R is hydrogen or a hydrocarbon group having 1 to 20 carbon atoms, and 0 to 98% by weight of structural units derived from an ethylenically unsaturated monomer, wherein the content of iron in the polymer is not larger than 20 ppm and the difference between the maximum value and minimum value of the degree of imidization is preferably not larger than 5% by weight. This methacrylimide-containing polymer is used alone or as a blend thereof with another thermoplastic polymer.

Methacrylimide-containing polymer and resin composition containing said

A methacrylimide containing polymer which is a thermoplastic polymer comprising from 2% to 100% by weight of a structural unit represented by the general formula: ##STR1## where R represents a hydrogen atom or an aliphatic group, aromatic group or cycloaliphatic hydrocarbon group with 1 to 20 carbon atoms and from 0 to 98% by weight of a structural unit derived from as ethylenic monomer, the polymer having

Methacrylimide containing polymer

A thermoplastic resin composition comprising:

Thermoplastic resin composition

A methacrylimide containing polymer which is a thermoplastic polymer comprising from 2 to 100% by weight of a structural unit represented by the general formula: ##STR1## where R represents a hydrogen atom or an aliphatic group, aromatic group or cycloaliphatic hydrocarbon group with 1 to 20 carbon atoms and from 0 to 98% by weight of a structural unit derived from as ethylenic monomer, the polymer having

A methacrylimide group-containing polymer having good optical characteristics, especially a resistance to coloration under heating and above to retain good light-transmitting characteristics for a long time even at a high temperature, is prepared by polymerizing methacrylic acid, a methacrylic acid ester, or a monomer mixture predominantly comprised of methacrylic acid or an ester thereof in the absence of a mercaptan chain transfer agent, and then imidizing the thus-prepared polymer. The resulting polymer is useful as the core component of a light-transmitting fiber having a core-sheath structure.

Process for preparation of methacrylimide group containing polymer and

A core-clad plastic optical fiber is described, comprising a polyglutarimide series polymer having a polymeric structural unit represented by formula (I) ##STR1## wherein R represents a hydrogen atom, an alkyl group, a cycloalkyl group, or an aromatic group and n represents a positive integer, having a thermal deformation temperture of at least 120.degree. C. as a core, and an organic polymer having a refractive index lower than the refractive index of the core as a clad layer, said plastic optical fiber having the characteristic that the light transmission loss measured at 655 nm is not more than 500 dB/km.

Plastic optical fibers

A methacrylimide containing polymer, which is a thermoplastic polymer comprising from 2 to 100% by weight of a structural unit represented by the general formula (I): ##STR1## where R represents a hydrogen atom or an aliphatic group, aromatic group or cycloaliphatic hydrocarbon group with 1 to 20 carbon atoms, and from 0 to 98% by weight of a structural unit derived from an ethylenic monomer, in which a distribution range of an imidization radio of the polymer is less than 5%. The methacrylimide containing polymer has excellent transparency and heat resistance.

A methacrylimide group-containing polymer having improved moldability as well as good heat resistance and transparency is prepared by heat treating a methacrylimide group-containing polymer having imide ring structural units of the formula: ##STR1## wherein R represents a hydrogen, an alkyl, cycloalkyl, aryl, alkaryl, aralkyl or allyl group 1 to 20 carbon atoms, at a temperature of 190 to 350 C. in the presence of a tertiary amine of the formula: ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 independently represent an alkyl, aryl, aralkyl or alkaryl group having 1 to 20 carbon atoms, and two of R.sub.1, R.sub.2 and R.sub.3 may be linked to form a ring together with the nitrogen atom.

Process for preparation of methacrylimide group-containing polymer

A process for producing continuously a methacrylimide group-containing polymer by adding a compound represented by the following formula:

Process for producing methacrylimide group-containing polymer

A reinforced resin composition which comprises 50-95% by weight of polyglutarimide resin and 5-50% by weight of carbon fibers. The polyglutarimide resin is one containing imide units of 2% by weight or more, represented by the formula, ##STR1## wherein R stands for hydrogen atom or an aliphatic, aromatic or alicyclic hydrocarbon group having 1 to 20 carbon atom(s).

Reinforced resin composition

Methacrylimide-containing polymers are continuously produced by introducing 10 to 60 wt. % of an inert solvent, 90 to 40 wt. % of methacrylic acid, a methacrylic acid ester or a monomer mixture comprising at least 50 wt. % of methacrylic acid or a methacrylic acid ester, and a radical polymerization initiator and a molecular weight modifier into a polymerization reaction zone, converting at least 80 wt. % of the charged monomer to a polymer at 60.degree.-170.degree. C., adding a compound represented by the formula:

Process for preparing methacrylimide-containing polymers

Disclosed is an improved light transmitting fiber comprising a transparent inorganic substance or organic polymeric material as a core component and a methacrylate polymer as a cladding component. The methacrylate polymer is a methacrylimide-containing fluoroalkyl methacrylate polymer comprising (A) 2 to 98 weight % of methacrylimide units of formula (I): ##STR1## wherein R represents a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, (B) 98 to 2 weight % of structural units derived from a fluoroalkyl methacrylate monomer, and (C) 0 to 50 weight % of structural units derived from a monomer copolymerizable with the monomer (B).

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Otake, Japan

Hisao Anzai