Konica Corporation

Kanebo, Limited

Konishiroku Photo Industry Co., Ltd.

Kazuto Kiyohara

Takanori Nakadate

Ichiya Harada

Toshiaki Yamazaki

Kentaro Noguchi

Toshiyuki Hagiwara

Kazuhiro Okuma

Yoshiyuki Funabashi

Shigeru Sakae

Hiromitsu Araki

Toshiki Komaita

Toshio Yamauchi

Naoko Shimomura

Hiromitu Araki

' Ichiya Harada

Michiteru Nakano

Junzo Shimokawa

Koji Kudama

A process for manufacturing a thermoplastic resin composition by melt-kneading a thermoplastic resin and fine particles or an additive, includes: introducing gaseous and/or liquid fluid containing fine particles of at most 10 .mu.m particle diameter or an additive to an unmelted granular or molten thermoplastic resin moving bed; adhering or depositing the fine particles or additive onto said moving bed, while the fluid in the gaseous state is being discharged; and then successively melt-kneading a mixture of the granular resin with the fine particles or additive. This process can be combined with a subsequent shaping step continuously that follows. The process of the invention saves energy, raw materials and labor consumptions and yields shaped articles of high quality and uniformity.

Processes for manufacturing thermoplastic resin compositions

Disclosed are a white polyester composition comprising a polyester containing a titanium dioxide, and the titanium dioxide being one subjected to a heat treatment at a temperature of 350.degree. C. or higher after at least one of an inorganic surface treatment and an organic surface treatment, and a support for photography having a polyester layer comprising the white polyester composition.

White polyester composition and support for photography

Disclosed is a reflective support for photography, comprising a polyester film containing titanium oxide particles, wherein the particle size distribution of the titanium oxide particles with particle sizes of 0.05 .mu.m or more satisfies the formula shown below:

Reflective support for photography

A process for producing a polyester resin composition containing at least 10 wt % of a white inorganic pigment dispersed in a polyester resin, which comprises kneading the polyester resin with the white inorganic pigment and thereafter subjecting the blend to a polycondensation reaction at a temperature ranging from the melting point of the polyester up to 300.degree. C. and at a reduced pressure of not higher than 5 Torr, is disclosed.

Process for producing polyester resin composition

A process for producing a titanium dioxide containing polyester resin composition from which a white film useful as a reflective photographic support can be prepared is disclosed. Said process is performed by first supplying a polyester resin and titanium dioxide into a continuous kneading extruder, kneading them in molten state, and supplying an additional charge of the polyester resin to give a desired concentration of the titanium dioxide, wherein the first supplied polyester resin has an intrinsic viscosity of at least 0.40, said titanium dioxide having an average particle size of 0.1-0.5 .mu.m and a water content of no more than 0.5% and having been surface-treated with an aluminum compound and/or a silicon compound, and the concentration of titanium dioxide being in the range of 20-70 wt % when kneaded with the polyester resin in molten state.

A base for reflection-photographic elements is disclosed which has a biaxially stretched film support, said film comprising polyester resin and titanium dioxide, wherein said film contains at least one compound represented by the following general formula (I) or (II). ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 each represents a hydrogen atom, a halogen atom, an unsubstituted or substituted alkyl group, an alkoxy group, a dialkylamino group or an aryl group, provided that R.sup.1, R.sup.2, R.sup.3 and R.sup.4 may cooperate to form a ring. ##STR2## wherein A represents --CH.dbd.CH--, ##STR3## and R.sub.6, R.sub.7, R.sub.8 and R.sub.9 each represents a hydrogen atom, a halogen atom, an unsubstituted or substituted alkyl group, an alkoxy group, a dialkylamino group or an aryl group, provided that R.sub.6 and R.sub.7, and R.sub.8 and R.sub.9 each may cooperate to form a ring.

Base for reflection-photographic elements

A method of manufacturing a photographic reflecting support wherein chips and/or resin scraps of a thermoplastic resin are heat-treated in a vacuum and fed into an extruder to be melted and then extruded in the form of a sheet out of the die of the extruder. The resulting sheet is then cooled and solidified on a cooled casting drum and stretched 6 to 16 times in terms of area, lengthwise and then widthwise or vice versa, or biaxially at the same time, at a temperature within the range of from a temperature not lower than the glass transition point of the thermoplastic resin to a temperature not higher than 150.degree. C. The stretched sheet is then thermoset at a temperature within the range of from a temperature not lower than 170.degree. C. to a temperature of the melting point of the thermoplastic resin and the resulting photographic reflecting support is made from 40 .mu.m to 300 .mu.m in thickness and not higher than 20% in visible-wave-length range transmittance.

Method of manufacturing a photographic reflecting support

A support for photographic use comprising a polyester film is disclosed which contains at least one compound of the following formula (I) and at least one quaternary ammonium salt of the following formula (II): ##STR1## a hydroxyl group, a nitro group, an amino group or a hydrogen atom; R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each a hydrogen atom, a halogen atom, an alkoxy group, an alkyl group, an aryloxy group, an aralkoxy group, a hydroxyalkyl group, --(OCH.sub.2).sub.m OH (m is an integer or 1 to 4) or ##STR2## B, C and D are not simultaneously at least one member selected from the group consisting of a hydrogen atom, a nitro group and an amino group); ##STR3## (wherein R.sub.6, R.sub.7, R.sub.8 and R.sub.9 are each an alkyl group, an aralkyl group or an allyl group; X is an anion; and n represents the number of charges on X).

Growing community of inventors

Hino, Japan

Kazuto Kiyohara