This disclosure describes 3a-(substituted-phenyl)-2,3,3a,4,7,7a-hexahydro[or 3a-(substituted-phenyl) octahydro]-4,7-alkano-1H-isoindoles which possess activity as antidepressants and as antistress agents in mammals.
This disclosure describes 3a-(substituted-phenyl)-2,3,3a,4,7,7a-hexahydro[or 3a-(substituted-phenyl)-octahydro]-4,7-alkano-1H-isoindoles which possess activity as anti-depressants and as antistress agents in mammals.
Additive for water-base drilling fluid and process
申请人:ATLANTIC RICHFIELD COMPANY
公开号:EP0143508A2
公开(公告)日:1985-06-05
An additive for water-base drilling fluid compositions used for drilling subterranean wells is disclosed. In one embodiment, the additive is a sulfonated copolymer of recurring units of a maleimide monomer and recurring units of a vinyl monomer. In another embodiment, the additive is a sulfonated terpolymer of recurring units of a maleimide monomer, recurring units of a vinyl monomer, and recurring units of a carboxyl-containing monomer. Water-base drilling fluids compositions which contain the additive and a process for drilling subterranean wells therewith are also disclosed.
An acrylic modified styrenic/N-arylmaleimide copolymer containing composition whith exhibits excellent melt flow properties, impact strength and gloss upon moulding is obtained by (A) polymerising at least one alkyl acrylate monomer in the presence of at least one polyfunctional acrylate crosslinking monomer; (B) forming a styrenic/N-arylmaleimide/1,3-diene terpolymer in the presence of the crosslinked polyacrylate prepared in (A); and (C) forming a styrenic/N-arylmaleimide copolymer in the presence of the crosslinked polyacrylate prepared in (A) and the styrenic/N-arylmaleimide/1,3-diene terpolymer prepared in (B).
A heat resistant copolymer composition is provided by blending two kinds of copolymers one of which is obtainable by polymerizing a maleimide monomer (A), an aromatic vinyl monomer (B), and unsaturated nitrile monomer (C) and optionally at least one other comonomer copolymerizable therewith (D) in a specific monomer ratio in the presence or absence of an elastomeric polymer and which has an intrinsic viscosity of 0.3 to 1.2 dl/g, and another of which is obtainable by copolymerizing the aromatic vinyl monomer (B), the unsaturated nitrile (C) and optionally at least one other comonomer copolymerizable therewith (D) in a specific monomer ratio in the presence or absence of the elastomeric polymer and which has an intrinsic viscosity of 0.3 to 1.5 dl/g.