Abstract: A liquid-crystalline copolymer comprising the repeating units represented by the following general formulas ##STR1## wherein each of r and p is an integer of 2 to 5, q is an integer of 0 to 3, m is an integer of 1 to 20, and R.sup.1 is ##STR2## R.sup.2 being --COOR.sup.3, --OR.sup.3 or --OCOR.sup.3 R.sup.3, ##STR3## each of R.sup.4 and R.sup.5 being --CH.sub.3 or a halogen atom, each of a and d being an integer of 0 to 10, b being an integer of 0 or 1, with the proviso that d is not 0 when R.sup.5 is --CH.sub.3, the repeating units [I] and [II] being present in the liquid-crystalline copolymer in a substantial molar ratio [I]:[II] of 1:1, exhibits ferroelectricity even at a temperature neighboring room temperature and having a high response speed to changes of external electric fields.

Abstract: This invention provides a high polymer having the following repeating unit (I), a diene compound which is represented by the following formula (II) and is a raw material of the high polymer: ##STR1## and a ferroelectric liquid-crystalline composition containing the high polymer and a low molecular weight smectic liquid-crystalline compound. The ferroelectric liquid-crystalline composition is easy to orient and exhibits a fast response against applied electric field.

Abstract: A high polymer comprising a recurring unit (I) represented by the formula: ##STR1## and a recurring unit (II) represented by the formula: ##STR2## wherein r, u, p and s each represent an integer of 2 to 5, q represents a number of 0 to 20, m represents an integer of 8 to 12, n represents an integer of 6 to 15, a represents an integer of 1 to 8, b represents an integer of 5 to 15, Y represents --0-- or --COO--, Z represents --O-- or a single bond, and * represents an asymmetric carbon,and a ferroelectric liquid crystal composition comprising the high polymer and a low molecular weight smectic liquid crystal are disclosed.

Abstract: According to the present invention, a reduction printing apparatus includes: an n-line memory unit (1) for storing an object line "n" to be thinned-out in binary images extended on a bit map;an n-1/n+1-line memory unit (2) for storing the first line "n-1" before the object line "n", or the first line "n+1" after the object line "n", an n-2/n+2-line memory unit (3) for storing the second line "n-21" before the object line "n" or the second line "n+2" after the object line "n"; an output means (1,2,4) for performing an OR logic process between the n-line memory unit (1) and the n-1/n+1-line memory unit (2), and outputting the result to an A-line memory (6); an output means (1,2,5) for performing an AND logic process between the n-line memory unit (1) and the n-1/n+1-line memory unit (2), and outputting the result to a B-line memory (7); and a 2-1-selector (8) selects either the A-line memory (6) or the B-line memory (7) in accordance with the content of the n-2/n+2-line memory unit (3), and outputs the result t

Abstract: Abrasive filaments made of a composition which comprises 95-70 vol.% of a polyvinylidene fluoride resin, whose inherent viscosity (.eta..sub.inh) ranges from 0.9 to 1.4, and 5-30 vol.% of abrasive grains. They are produced by melt-spinning the composition and then stretching the resultant filaments at a draw ratio of 2.5 times-5.5 times within a temperature range of 100-200.degree. C.

Abstract: A liquid-crystalline copolymer comprising the repeating units represented by the following general formulas ##STR1## wherein each of r and p is an integer of 2 to 5, q is an integer of 0 to 3, m is an integer of 1 to 20, and R.sup.1 is ##STR2## R.sup.2 being --COOR.sup.3, --OR.sup.3 or --OCOR.sup.3, R.sup.3 being ##STR3## each of R.sup.4 and R.sup.5 being --CH.sub.3 or a halogen atom, each of a and d being an integer of 0 to 10, b being an integer of 0 or 1, with the proviso that d is not 0 when R.sup.5 is --CH.sub.3,the repeating units [I] and [II] being present in the liquid-crystalline copolymer in a substantial molar ratio [I]:[II] of 1:1, exhibits ferroelectricity even at a temperature neighboring room temperature and having a high response speed to changes of external electric fields.

Abstract: A protective coating made of resin, preferably a radiation curable resin containing fluoroplastic fine particles having a low surface energy is provided in the form of the uppermost layer facing a magnetic head, thereby improving the frictional properties and durability of a magneto-optical disc that is used with a magnetic field modulation system in which the magnetic head comes in constant contact therewith.

Abstract: A high polymer comprising a recurring unit (I) represented by the formula: ##STR1## and a recurring unit (II) represented by the formula: ##STR2## wherein r, u, p and s each represent an integer of 2 to 5, q represents a number of 0 to 20, m represents an integer of 8 to 12, n represents an integer of 6 to 15, a represents an integer of 1 to 8, b represents an integer of 5 to 15, Y represents --O-- or --COO--, Z represents --O-- or a single bond, and * represents an asymmetric carbon, and a ferroelectric liquid crystal composition comprising the high polymer and a low molecular weight smectic liquid crystal are disclosed.

Abstract: A liquid-crystalline polymer having the repeating units represented by the following general formula (II): ##STR1## wherein R.sup.1 is ##STR2## wherein a is an integer having a value of 1 to 10,b is an integer having a value of 0 or 1,c is an integer having a value of 1 to 30,X.sup.1 is --COO--, --O-- or a single bond,M.sup.1 is ##STR3## and d is an integer having a value of 1 to 5.The liquid-crystalline polymer exhibits ferroelectricity in a wide temperature range including room temperature and has a high speed of response to electric field.

Abstract: Abrasive filaments made of a composition which comprises 95-70 vol. % of a polyvinylidene fluoride resin, whose inherent viscosity (.eta..sub.inh) ranges from 0.9 to 1.4, and 5-30 vol. % of abrasive grains. They are produced by melt-spinning the composition and then stretching the resultant filaments at a draw ratio of 2.5 times-5.5 times within a temperature range of 100.degree.-200.degree. C.

Abstract: A liquid-crystalline polymer having the repeating units represented by the following general formula (II): ##STR1## wherein R.sup.1 is ##STR2## wherein a is an integer having a value of 1 to 10,b is an integer having a value of 0 or 1,c is an integer having a value of 1 to 30,X.sup.1 is --COO--, --O-- or a single bond,M.sup.1 is ##STR3## d is an integer having a value of 1 to 5. The liquid-crystalline polymer exhibits ferroelectricity in a wide temperature range including room temperature and has a high speed of response to electric field.

Abstract: Disclosed herein are poly(phenylene sulfide) fibers having a tensile strength of at least 3.5 g/d, a knot tenacity of at least 2 g/d, a loop tenacity of at least 3.5 g/d, the number of abrasion cycles until breaking in a flexing abrasion test of at least 3,000 times, and the number of repeated flexings until breaking in a flexural fatigue test of at least 150 times. A process for the production of poly(phenylene sulfide) fibers, which comprises melt-spinning a poly(phenylene sulfide), stretching the resultant unstretched filaments at a draw ratio of 2:1 to 7:1 within a temperature range of 80.degree.-260.degree. C., and heat-treating the stretched filaments for 0.1-30 seconds under conditions of a take-up ratio of 0.8:1 to 1.35:1 in a dry heat atmosphere exceeding 285.degree. C., but not exceeding 385.degree. C., is also disclosed.

Abstract: Disclosed herein are a poly(arylene thioether) block copolymer alternately comprising (A) at least one poly(arylene thioether-ketone) block having predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- are in the para position to each other and (B) at least one poly(arylene thioether) block having predominant recurring units of the formula ##STR2## (a) the ratio of the total amount of the poly(arylene thioether) block (B) to the total amount of the poly(arylene thioether-ketone) block (A) being within a range of 0.05-5 by weight, (b) the average polymerization degree of the poly(arylene thioether) block (B) being at least 10, and (c) said block copolymer having a melt viscosity of 2-100,000 poises as measured at 350.degree. C. and a shear rate of 1,200/sec as well as a production process the poly(arylene thioether) block copolymer.

Abstract: Disclosed herein are a poly(arylene thioether) block copolymer alternately comprising (A) at least one poly(arylene thioether-ketone) block having predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- are in the para position to each other and (B) at least one poly(arylene thioether) block having predominant recurring units of the formula ##STR2## (a) the ratio of the total amount of the poly(arylene thioether) block (B) to the total amount of the poly(arylene thioether-ketone) block (A) being within a range of 0.05-5 by weight, (b) the average polymerization degree of the poly(arylene thioether) block (B) being at least 10, and (c) said block copolymer having a melt viscosity of 2-100,000 poises as measured at 350.degree. C. and a shear rate of 1,200/sec as well as a production process the poly(arylene thioether) block copolymer.

Abstract: Disclosed herein are a poly(arylene thioether) block copolymer alternately comprising (A) at least one poly(arylene thioether-ketone) block having predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- are in the para position to each other and (B) at least one poly(arylene thioether) block having predominant recurring units of the formula ##STR2## (a) the ratio of the total amount of the poly(arylene thioether) block (B) to the total amount of the poly(arylene thioether-ketone) block (A) being within a range of 0.05-5 by weight, (b) the average polymerization degree of the poly(arylene thioether) block (B) being at least 10, and (c) said block copolymer having a melt viscosity of 2-100,000 poises as measured at 350.degree. C. and a shear rate of 1,200/sec as well as a production process the poly(arylene thioether) block copolymer.

Abstract: Disclosed herein are a poly(arylene thioether) block copolymer alternately comprising (A) at least one poly(arylene thioether-ketone) block having predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- are in the para position to each other and (B) at least one poly(arylene thioether) block having predominant recurring units of the formula ##STR2## (a) the ratio of the total amount of the poly(arylene thioether) block (B) to the total amount of the poly(arylene thioether-ketone) block (A) being within a range of 0.05-5 by weight, (b) the average polymerization degree of the poly(arylene thioether) block (B) being at least 10, and (c) said block copolymer having a melt viscosity of 2-00,000 poises as measured at 350.degree. C. and a shear rate of 1,200/sec as well as a production process the poly(arylene thioether) block copolymer.

Abstract: Disclosed herein are stretched poly(arylene thioether) block copolymer films and a production processes thereof, said block copolymer film comprising a thermoplastic material composed of (A) 100 parts by weight of a particular poly(arylene thioether) block copolymer, (B) up to 100 parts by weight of at least one other thermoplastic resin, and (C) up to 15 parts by weight of at least one filler.

Abstract: Disclosed herein are melt-stable thermoplastic resin compositions comprising (A) 100 parts by weight of a particular poly(arylene thioether) block copolymer, (B) --400 parts by weight of at least one of thermoplastic resins, and (C) 0-400 parts by weight of at least one filler per 100 parts by weight of the resin components. At least either one of Component (B) and Component (C) is contained in a proportion of at least 0.1 part by weight per 100 parts by weight of Component (A). The poly(arylene thioether) block copolymer alternately comprise at least one poly(arylene thioether-ketone) block having predominant recurring units of the formula ##STR1## wherein the --CO-- and --S-- are in the para position to each other and at least one poly(arylene thioether) block having predominant recurring units of the formula ##STR2## Also disclosed are compositions obtained by stabilizing by the melt-stable thermoplastic resin compositions with a basic compound and products molded or formed product from these compositions.

Abstract: A sintered ferro alloy comprises 5 to 25 wt % of one or two elements selected from Mo and W, 2 to 10 wt % of Cr, 0.1 to 0.9 wt % of Si, less than or equal to 0.7 wt % of Mn, less than or equal to 0.05 wt % of P, 0.5 to 2.0 wt % of C, 0.5 to 2.0 wt % of B, 0.1 to 7.0 wt % of at least one element selected from borides of La, Ce, Nd, Sm, Eu, Gd, Yb, Y or Sc, residual Fe, and contaminants. Also the alloy may comprise less than or equal to 20 wt % of at least one element selected from V, Nb, Ta, Ti, Zr, Hf, Co or Ni, if necessary. The alloy is produced by mixing the above mentioned components and pressurizing them in an Fe matrix, then sintering the pressurized mixture at 1150.degree. C. to 1260.degree. C. for 60 min. and reheating after sintering. This alloy has wear and heat resistance and can be utilized as valve seats for internal combustion engines in automotive vehicles.

Abstract: Disclosed herein are poly(arylene thioether) block copolymer fibers formed by melt-spinning a thermoplastic material composed of (A) 100 parts by weight of a particular poly(arylene thioether) block copolymer, (B) up to 50 parts by weight of at least one other thermoplastic resin and (C) up to 10 parts by weight of at least one filler.