Abstract: A pin secured at one end of a link is inserted into an L-shaped groove of a ock lever pivoted to the upper surface of an upper guide rail and the other end of the link is connected to an actuator by way of a wire. The hook of the lock lever can be inserted into the hook hole of the flange of the lower guide rail. Rotating of the lock lever and thus rotation of the upper guide rail relative to the lower guide rail by an accidental external force to the lock lever can be prevented in the rotatable seat.

Abstract: A copolymer having repeating units of the following formula (I) and repeating units of the formula (II), wherein the ration of (I) to (II) is within a range of from 10:90 to 90:10 by weight ratio, and the number average molecular weight is at least 1,000, or the intrinsic viscosity .eta..sub.inh is at least 0.02: ##STR1## wherein A is a polyester unit having a polymerization degree of from 2 to 200, R.sup.3 is a bivalent organic group having an ester, urethane or ketone bond, and R.sup.4 is a hydrogen atom or a methyl group, ##STR2## wherein R.sup.5 is a hydrogen atom or a methyl group, and X is a substituent having functionality.

Abstract: A polyurethane polyol obtained by reacting a hydrocarbon diol of the formula (A):HO--R--OH (A)wherein R is a C.sub.7-20 linear or branched alkylene group, with isophorone diisocyanate and having a number average molecular weight of from 500 to 20,000.

Abstract: The present invention relates to a novel modified silicate composition obtained by reacting an alkyl silicate or its oligomer with a certain specific active hydrogen-containing compound in a certain specific ratio.

Abstract: Disclosed herein is a process for producing an azo group-containing polymer comprising polycondensing a compound having an azo group in the main molecular chain and an alcoholic hydroxyl group, phenolic hydroxyl group, imino group or amino group at both ends thereof with a dicarboxylic acid chloride or a carbonate precursor except the polycondensation of a compound having an azo group in the main molecular chain and an alcoholic hydroxyl group at both ends thereof with a carbonate precursor.

Abstract: This invention provides a polyester, which is composed of a constitutive unit of formula (I) and a constitutive unit of formula (II) in a proportion of (I)/(II) of being from 0.1/99.9 to 99.1/0.1 as a molar ratio and which has a logarithmic viscosity (.eta..sub.inh) of being 0.1 or more: ##STR1## where R.sub.0 is a fluorine-free monovalent organic group having from 1 to 40 carbon atoms, R.sub.1, R.sub.2 and R.sub.3 are independently a divalent organic group having from 1 to 40 carbon atoms, and n is 0 or 1.This invention also provides a method of preparing the polyester, in which (A) a monoepoxy compound of formula (III) ##STR2## where R.sub.0 and n have the same meanings as mentioned above, (B) a polyester or a polyester precursor and (C) a dicarboxylic acid compound are reacted and polymerized.

Abstract: Disclosed herein is a thermoplastic polyester molded article comprising a thermoplastic polyester and at least one of the specified diimide compounds, the latter being blended in an amount effective for ultraviolet screening. The polyester molded article and a composition for producing it according to this invention is capable of screening ultraviolet rays not only in the short wavelength region but also in the long wavelength region and has uniform dispersion stability and thermal stability. The molded articles of the present invention are free of undesired coloration and deposition of extraneous matter.

Abstract: A copolyamide acid comprising repeating units represented by the general formulas: ##STR1## in which the repeating unit (A) and the repeating unit (B) are present in a molar ratio from 20:80 to 80:20, and which has a logarithmic viscosity number (.eta..sub.inh) of 0.5 dl/g--10 dl/g measured in N,N-dimethylformamide at a concentration of 0.5 g/dl and at a temperature of 30.degree. C. and a copolyimide comprising repeating units represented by the general formulas: ##STR2## in which the repeating unit (C) and the repeating unit (D) are present in a molar ratio from 20:80 to 80:20 and which has a logarithmic viscosity number (.eta..sub.inh) of o.5 dl/g--10 dl/g measured in 97% concentrated sulfuric acid at a concentration of 0.5 g/dl and at a temperature of 30.degree. C.