摘要:
A description follows of epoxydated block copolymers, either linear or branched, which can be defined with the following formulae:1) [A-(E-B-EPOX)].sub.n X2) A.sub.1 -(E.sub.1 -B.sub.1 -EPOX.sub.1)-A-HT-(E.sub.2 -B.sub.2 -EPOX.sub.2)3) [(E.sub.1 -B.sub.1 -EPOX.sub.1)-HT-A(E.sub.2 -B.sub.2 -EPOX.sub.2)].sub.n Xwhere A is a polyvinylaromatic block in a percentage ranging from 10 to 50% by weight, E-B-EPOX is a block composed of ethylene units, epoxydated butene and diene units in which the percentage by weight of the epoxy group ranges from 1% to 40%, HT is a tapered copolymer segment made up of hydrogenated and epoxydated diene monomeric units and vinylaromatic units whose content ranges from 0 to 20%, x is a radical having a valence ranging from 1 to 20.The block copolymers have an average molecular weight ranging from 30,000 to 400,000, a content of polyvinylaromatic blocks of between 10 and 50% by weight and a content of (E.sub.1 -B.sub.1 -EPOX.sub.1)+(E.sub.2 -B.sub.2 -EPOX.sub.2) blocks ranging from 90 to 50% by weight; the weight ratio between (E.sub.1 -B.sub.1 -EPOX.sub.1) and (E.sub.2 -B.sub.2 -EPOX.sub.2) ranges from 0.1 to 1.0. These polymers are used in the preparation of polymeric compositions based on engineering polymers such as polyamides, polycarbonate, polyesters, improving their physical properties and above all their impact strength and in mixtures with oils and hydrocarbon resins to produce materials having excellent adhesion of polar substrates.
摘要翻译:下面描述直链或支链的环氧化嵌段共聚物,其可以用下式定义:1)[A-(EB-EPOX)] n X 2)A1-(E1-B1-EPOX1)-A-HT - (E2-B2-EPOX2)3)[(E1-B1-EPOX1)-HT-A(E2-B2-EPOX2)] n X其中A为10至50重量%的聚乙烯基芳族嵌段, EB-EPOX是由乙烯单元,环氧化丁烯和二烯单元组成的嵌段,其中环氧基的重量百分比为1%至40%,HT是由氢化和环氧化二烯单体单元组成的渐缩共聚物链段, 乙烯基芳族单元的含量范围为0至20%,x为1至20的化合价。嵌段共聚物的平均分子量范围为30,000至400,000,聚乙烯基芳族嵌段的含量为10至50%,通过 (E1-B1-EPOX1)+(E2-B2-EPOX2)嵌段的含量为90〜50重量% (E1-B1-EPOX1)与(E2-B2-EPOX2)之间的重量比为0.1〜1.0。 这些聚合物用于制备基于聚酰胺,聚碳酸酯,聚酯等工程聚合物的聚合物组合物,改善其物理性能,最重要的是它们的冲击强度,以及与油和烃树脂的混合物,以制备具有优异极性粘合性的材料。
摘要:
A linear copolymer constituted by four alternating blocks:B1-A1-B2-A2wherein:B1 and B2 are polydienic blocks, and preferably polybutadiene blocks, andA1 and A2 are polyvinylaromatic, and preferably polystyrene blocks;which polymer has a weight average molecular weight of from 30,000 to 250,000, and a global content of monomer dienic units of from 40 to 80% by weight, wherein the weight average molecular weight of B1 block is comprised within the range of from 0.1 to 0.5 times the weight average molecular weight of B2 block, and the weight average molecular weight of A1 block is comprised within the range of from 0.25 to 2.0 times the weight average molecular weight of A2 block, and which contains between B1 and A1 blocks a copolymeric moiety formed by randomly linked monomer dienic and vinylaromatic units; is endowed with a desired balance of mechanical characteristics, rheologic characterisatics and characteristics of thermooxidative resistance.The process to prepare such a block copolymer is disclosed.
摘要:
A description follows of epoxydated block copolymers, either linear or branched, which can be defined with the following formulae:1) [A--(E--B--EPOX)].sub.n X2) A.sub.1 --(E.sub.1 --B.sub.1 --EPOX.sub.1)--A--HT--(E.sub.2 --B.sub.2 --EPOX.sub.2)3) [(E.sub.1 --B.sub.1 --EPOX.sub.1)--HT--A(E.sub.2 --B.sub.2 --EPOX.sub.2)].sub.x Xwhere A is a polyvinylaromatic block in a percentage ranging from 10 to 50% by weight, E--B--EPOX is a block composed of ethylene units, epoxydated butene and diene units in which the percentage by weight of the epoxy group ranges from 1% to 40%, HT is a tapered copolymer segment made up of hydrogenated and epoxydated diene monomeric units and vinylaromatic units whose content ranges from 0 to 20%, x is a radical having a valence ranging from 1 to 20.The block copolymers have an average molecular weight ranging from 30,000 to 400,000, a content of polyvinylaromatic blocks of between 10 and 50% by weight and a content of (E.sub.1 --B.sub.1 --EPOX.sub.1)+(E.sub.2 --B.sub.2 --EPOX.sub.2) blocks ranging from 90 to 50% by weight; the weight ratio between (E.sub.1 --B.sub.1 --EPOX.sub.1) and (E.sub.2 --B.sub.2 --EPOX.sub.2) ranges from 0.1 to 1.0. These polymers are used in the preparation of polymeric compositions based on engineering polymers such as polyamides, polycarbonate, polyesters, improving their physical properties and above all their impact strength and in mixtures with oils and hydrocarbon resins to produce materials having excellent adhesion of polar substrates.
摘要:
A branched block copolymer is described, which can be defined by the formula (B.sub.1 --T--A--B.sub.2).sub.n X, where B.sub.1 and B.sub.2 are polydiene blocks, A is an aromatic polyvinyl block, T is a random copolymer segment made up of dienic monomeric and aromatic vinyl units, X is a coupling radical having a valence equal to n, and n is a whole number ranging from 3 to 20.This kind of block copolymer is used in formulations of adhesives having an excellent balance of adhesive, cohesive, rheological characteristics, as well as resistance to heat oxidation, and in compositions together with thermoplastic polymers capable of giving products with improved shock resistance and transparency.
摘要:
A branched and hydrogenated block copolymer can be defined by the formula [(EB).sub.1 --HT--A--(EB).sub.2 ].sub.n X, where (EB).sub.1 and (EB).sub.2 are hydrogenated polydiene blocks, A is a polyvinylaromatic block, HT is a random copolymer segment made up of hydrogenated dienic monomeric and vinylaromatic units, X is a coupling radical having a valence equal to n, and n is a whole number ranging from 3 to 20.This kind of block copolymer shows excellent mechanical characteristics and resistance to atmospheric agents, even when used in combination with other resins.
摘要:
High transparency polymeric composition essentially consisting of: (1) from 30 to 95% of polystyrene; (2) from 70% to 5% of a composition of vinylarene-conjugated diene block copolymers; the percentage sum of (1) and (2) being equal to 100; the composition (2) consisting of: (2a) from 30 to 60% by weight of copolymers with a linear structure (2b) from 70% to 40% by weight of copolymers with a branched structure; the weight average molecular weight of the above composition (2) ranging from 30,000 to 400,000, preferably from 50,000 to 200,000.
摘要:
Linear copolymers with four alternating blocks, represented by the following formula:B.sub.1 -T-A.sub.1 -B.sub.2 -A.sub.2where: A.sub.1 and A.sub.2 are polyvinylaromatic blocks, B.sub.1 and B.sub.2 are blocks consisting of ethylene-butene-1 or ethylene-propylene copolymers, and T is a statistical terpolymer segment formed from ethylene-propylene-vinylarene or ethylene-butene-1-vinylarene monomer units.The copolymers are characterized by a weight-average molecular weight of between 20,000 and 300,000 and a total content of vinylaromatic units of between 10 and 60% by weight. The ratio of the weight-average molecular weight of block A.sub.1 to that of block A.sub.2 is a number between 0.25 and 2.0, and the ratio of the weight-average molecular weight of block B.sub.1 to that of block B.sub.2 is a number between 0.05 and 0.5.The copolymers exhibit an optimum balance of mechanical, rheological and thermo-oxidation resistance properties and can be obtained by hydrogenating block-copolymers of vinylaromatic monomers with conjugated diene monomers.
摘要:
An etherified acetal homopolymer is stabilized by heat-treating said homopolymer suspended in a liquid diluent chosen from water or mixtures thereof with polar organic compounds, preferably in the presence of a basic compound, at a temperature of 100.degree.-160.degree. C and below the melting point of the homopolymer, thereby to substantially degrade the unstable fraction of said homopolymer.
摘要:
A branched block copolymer is described, which can be defined by the formula (B.sub.1 -T-A-B.sub.2).sub.n X, where B.sub.1, and B.sub.2 are polydiene blocks, A is an aromatic polyvinyl block, T is a random copolymer segment made up of dienic monomeric and aromatic vinyl units, X is a coupling radical having a valence equal to n, and n is a whole number ranging from 3 to 20. This kind of block copolymer is used in formulations of adhesives having an excellent balance of adhesive, cohesive, rheological characteristics, as well as resistance to heat oxidation, and in compositions together with thermoplastic polymers capable of giving products with improved shock resistance and transparency.
摘要:
Radial and branched block copolymers show a structure: ##STR1## wherein: Z is a radical deriving from a tetrafunctional coupling agent;A is a polystyrene block;B is a polybutadiene blockm, n, p, q are either 1 or zero, with the condition that their sum is comprised within the range of from 1 to 4.Compositions of block copolymers comprise the hereinabove disclosed radial and branched block copolymers, blended with a two-block copolymer B-A, and an "A" homopolymer.The process for the preparation of said radial and branched block copolymers and of the related compositions is disclosed, and furthermore their use is disclosed in bituminous compositions, in order to improve the general characteristics of the bitumens.