摘要:
Rubber-reinforced vinyl aromatic polymers having a strictly bimodal morphology, comprising from 55 to 90% by weight of a rigid polymeric matrix and from 10 to 45% by weight of a rubbery phase dispersed inside said rigid polymeric matrix, in the form of grafted and occluded particles and wherein said rubber particles consist of from 60 to 99% by weight of particles with a capsule or “core-shell” morphology and from 1 to 40% by weight of particles with a “salami” morphology, said percentages being measured on the basis of the weight of the rubber particles only.
摘要:
Rubber-reinforced vinyl aromatic polymers having a strictly bimodal morphology, comprising from 55 to 90% by weight of a rigid polymeric matrix and from 10 to 45% by weight of a rubbery phase dispersed inside said rigid polymeric matrix, in the form of grafted and occluded particles and wherein said rubber particles consist of from 60 to 99% by weight of particles with a capsule or “core-shell” morphology and from 1 to 40% by weight of particles with a “salami” morphology, said percentages being measured on the basis of the weight of the rubber particles only.
摘要:
Vinyl aromatic (co) polymer reinforced with a rubber selected from a linear diene rubber (i) with a solution viscosity lower than 70 cPs; a partially radial diene rubber (ii), with a solution viscosity lower than 70 cPs; a three-chain diene rubber (iii) with a solution viscosity lower than 70 cPs; a blend of linear diene rubbers (i) and radial diene rubbers (iv) in a maximum ratio between them (i)/(iv) of between 99.5/0.5 and 85/15.
摘要:
A rubber-reinforced vinyl aromatic (co)polymer comprising a polymeric matrix and a rubber phase dispersed and/or grafted in the polymeric matrix and consisting of a mixture of(i) a diene rubber and(ii) a vinyl aromatic monomer/conjugated 1,3-diene linear block copolymer, said block copolymer having a diene content exceeding 80 wt % and, respectively, a vinyl aromatic monomer content of less than 20 wt %.
摘要:
Process for the preparation of vinylaromatic copolymers reinforced with rubber which comprises:a) dissolving a dienic rubber (i) and/or a linear block elastomer, vinylaromatic monomer-1,3 conjugated diene (ii), in a mixture comprising at least one vinylaromatic monomer and a pair of solvents consisting of a polar solvent and a nonpolar solvent;b) polymerizing the solution thus obtained, possibly in the presence of an initiator.
摘要:
Process for the preparation of ABS which comprises: a) preparing a solution consisting of a diblock linear rubber of the type S-B dissolved in a mixture of monomers comprising styrene and acrylonitrile; b) feeding to the solution of step (a) at least one preformed ABS resin having an average volumetric diameter of the rubber particles contained in the polymeric matrix of more than 1.5 .mu.; c) dissolving the preformed ABS in the solution of step (a); d) feeding in continuous the solution thus obtained to a polymerization reactor for ABS resins; e) polymerizing the final solution to produce an ABS with a multimodal morphology.
摘要:
Process for the continuous production in solution of styrene thermoplastic resins by polymerization of a vinyl-aromatic monomer and of a vinyl-nitrile monomer in the presence of an elastomer and of a starter, wherein polymerization is conducted in two or more steps, wherein the elastomeric component is fed, in solution in the solvent and/or in the monomers, to the first step, polymerization is carried out in the subsequent steps at temperatures ranging from 70.degree. to 150.degree. C., in each step the reaction mass is gently and homogeneously stirred and the reaction product is caused to flow to a thin evaporator heated at 150.degree.-300.degree. C.