Abstract:
An aliphatic polyester which is obtained by reacting a lactone and a lactide with a high-boiling monohydric alcohol or a metal alkoxide through ring-opening polymerization and in which the contents of terminal OH and COOH have been reduced to 50 % or lower and 30 % or lower, respectively, or reduced to lower values by bonding ends of the yielded polymer to a diisocyanate. It has regulated thermal, hydrolytic, and biological degradability. From the polyester composition is obtained an agricultural or horticultural, particulate composition which is capable of being regulated with respect to the duration of fertilization and leaves no decomposition products remaining in the soil. From the resin consisting mainly of a fatty acid/cellulose ester derivative are obtained: a base film for marking films which is free from problems such as the volatilization or migration of plasticizers; a thermal transfer image receptor which is capable of forming recorded images and is excellent in releasability, developed-color density, and brightness; a conductive coating composition excellent in storage stability, adhesion, and conductivity; and a one-pack type coating material, moisture-curable graft copolymer, and coating composition which each is neither toxic nor stimulant and has excellent dryability. The copolymer in which the average length of the lactide and lactone unit chains has been regulated is excellent in heat resistance and impact resistance.
Abstract:
A process for producing a lactone polyester/unsaturated monomer represented by the structural formula (1), characterized by reacting a carboxylated, radical-polymerizable, unsaturated monomer with a cyclic lactone in the presence of water added in an amount of 1 to 50 parts by weight per 100 parts by weight of the sum of the carboxylated, radical-polymerizable, unsaturated monomer and the cyclic lactone with the aid of an acid catalyst at ordinary pressure and subsequently conducting a dehydration reaction under vacuum so as to remove low-boiling matters to thereby form an ester linkage between the carboxylated, radical-polymerizable, unsaturated monomer and a lactone oligomer which is a by-product of a reaction initiated by the water added and reduce the hydroxy value to 5.0 mg-KOH/g or lower. Thus, a carboxy-terminated lactone polyester/unsaturated monomer of practical quality can be produced at low cost. Formula (1) (In the formula, R1, R2, R3, R4, R5, R6, and R7 each represents hydrogen or a substituent selected among C1-10 (un)substituted alkyl, (un)substituted aryl, (un)substituted alkoxycarbonyl, (un)substituted alkoxy, (un)substituted aryloxy, and halogeno; n is an integer of 1 to 7; and m is an integer of 1 to 100.)
Abstract:
A high-molecular aliphatic polyester copolymer; a high-molecular aliphatic polyester copolymer containing polylactic acid; processes for industrially producing these copolymers; compositions of these copolymers; and various uses thereof. These copolymers have practical properties which make the copolymers moldable. They are free from the problem of plasticizer bleeding and can be degraded by microorganisms present in soils or water. They give moldings, such as sheets and films, which combine a sufficient strength with tear resistance. When the copolymers are ones having a branched structure, they give a molding having excellent mechanical properties. The moldings obtained from compositions containing either of these copolymers are excellent in elongation and biodegradability and have a satisfactory balance therebetween. In particular, blending with one or more other biodegradable resins gives a molding having better moldability.
Abstract:
This method provides a novel trimethylcatechol diester, i.e. 3,4,5-trimethylcatechol diester, at a high yield by reacting 2,6,6-trimethylcyclohexe-2-en-1,4-dione with an acylating agent in the presence of an acid catalyst. The acylating agent includes a C2-4 carboxylic acid anhydride (e.g. acetic anhydride) and a C2-4 carboxylic acid halide (e.g. acetyl chloride). The catalyst includes a protonic acid and a Lewis acid. Use of a polar solvent (e.g. halogenated hydrocarbon), as the reaction catalyst, results in an enhanced efficiency in the production of the object compound.
Abstract:
This method provides a novel trimethylcatechol diester, i.e. 3,4,5-trimethylcatechol diester, at a high yield by reacting 2,6,6-trimethylcyclohexe-2-en-1,4-dione with an acylating agent in the presence of an acid catalyst. The acylating agent includes a C2-4 carboxylic acid anhydride (e.g. acetic anhydride) and a C2-4 carboxylic acid halide (e.g. acetyl chloride). The catalyst includes a protonic acid and a Lewis acid. Use of a polar solvent (e.g. halogenated hydrocarbon), as the reaction catalyst, results in an enhanced efficiency in the production of the object compound.
Abstract:
A thermoplastic resin composition can be obtained by adding about 0.1 to 20 parts by weight of a diene-series block copolymer (2) to 100 parts by weight of a resin composition containing a polycarbonate-series resin (1) as a basic component of which the proportion of terminal hydroxy groups relative to the whole of the terminals is 1 mole% or above (about 5 to 40 mole%). The polycarbonate-series resin base may further comprise a thermoplastic resin composition (3) such as a rubber-modified styrenic resin. The block copolymer component (2) includes an epoxy-modified block copolymer, etc. When added an organophosphorus compound as a flame retardant (4), or a fluorine-containing resin as a flame-retartant auxiliary (5), a halogen-free flame-retardant thermoplastic resin composition can be obtained. A thermoplastic resin with an improved flowability and impact strength can be obtained by modifying a polymer blend of the polycarbonate-series resin and the styrenic-series resin in quality.
Abstract:
PROBLEM TO BE SOLVED: To obtain a biodegradable high molecular weight copolyester having practically usable physical properties and formable into a film as well, and to provide a method for producing the copolyester enabling to supply it industrially. SOLUTION: This high molecular weight aliphatic copolyester having weight average molecular weight of >=40,000 is composed of a repeating unit (P) derived from succinic acid-1,4-butane diol, a repeating unit (Q) derived from ε- caprolactone and a repeating unit (R) derived from a lactide.
Abstract:
PROBLEM TO BE SOLVED: To provide a water soluble heat sensitive self-adhesive composition capable of giving a heat sensitive self-adhesive sheet having such a property that the sheet attached to an adherend such as a container, is easily released by the use of water at ordinary temperature, when the composition is used as a self-adhesive for the heat sensitive self-adhesive sheet (label). SOLUTION: This water soluble heat sensitive self-adhesive composition contains a solid plasticizer, a thermoplastic resin, and a tackifier, wherein the composition further contains a hydrophilic component in an amount of 0.05-5 wt.% converted to a solid material. The solid plasticizer preferably comprises (i) a polyester compound of a hydroxy compound with a polybasic acid, (ii) an ester compound of a polyhydroxy compound with an organic monobasic acid, and (iii) a phosphor compound. The hydrophilic component preferably comprises at least one component selected from a group comprising a nonionic surfactant having a hydrophilic-lipophilic balance (HLB) of >=15, phosphoric acid ester salts, and dialkylsulfosuccinic acid salts.
Abstract:
PROBLEM TO BE SOLVED: To obtain a styrenic resin sheet capable of continuing anti-fogging properties at low temp. and high temp. for a long time. SOLUTION: An anti-fogging styrenic resin sheet is obtained by applying an anti-fogging agent containing sugar fatty acid ester and polyglycerine fatty acid ester with an HLB of about 11-18 to at least one surface of a styrenic resin sheet. The ratio of sugar fatty acid ester and polyglycerine fatty acid ester is about former/latter = 55/45-98/2 (pts.wt.). Polyglycerine fatty acid ester is constituted of about 12-26C fatty acid. The anti-fogging agent may contain about 0-50 pts.wt. of a nonionic surfactant and/or about 0-400 pts.wt. of a mold release agent per 100 pts.wt. of fatty acid esters. The styrenic resin sheet can be produced by applying the anti-fogging agent to at least one surface of the sheet and suitable for molding a container.