The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 1976
Filed:
Oct. 27, 1972
Julian Alfred Waters, Reading, EN;
Imperial Chemical Industries Limited, London, EN;
Abstract
A dispersion is described of block copolymer particles in a saturated aliphatic hydrocarbon diluent, the block copolymer consisting of a thermoplastic tertiary butyl styrene polymer block A of molecular weight 10,000-100,000 which is soluble in the diluent, an elastomeric conjugated diene polymer block B of molecular weight 1,000-100,000 which is terminally attached to block A, and a styrene homopolymer or copolymer block C of molecular weight 20,000-1,000,000 which is terminally attached to block B, is insoluble in the diluent and forms at least part of the core of the particles. The particles may be separated from the diluent while retaining their previous molecular organization, i.e. with the insoluble block C present in the core of the particles and the thermoplastic block A remote from the core, and may be converted by hot pressing into shaped articles having impact resistance. A process is also described for producing such a particle dispersion by anionic polymerization of monomers in the hydrocarbon diluent to form successively the polymer blocks A, B and C.