Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
1999-09-01
2001-05-22
Seidleck, James J. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S098000, C524S504000, C524S505000
Reexamination Certificate
active
06235841
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a composition of hydrogenated block copolymers having an optimum balance between mechanical properties and rheological properties.
The present invention also relates to the process for the preparation of the above copolymers.
DESCRIPTION OF RELATED ART
Vinyl-arene/hydrogenated diene block copolymers are characterized by a very high viscosity compared with analogous non-hydrogenated products. From the point of view of application, this characteristic represents a great limit; it is therefore often necessary to resort to formulations in which the copolymer is diluted with fillers or other polymers having a lower viscosity. This often causes a reduction in the mechanical properties of the mixture and can therefore not always be put into use.
A partial first solution of the above problem is the use of linear multi-block structures (see for example U.S. Pat. No. 5,164,455) and star structures of the (AB)
x
type wherein x is a number from 3 to 6.
These copolymers, both with a linear multi-block and star structure, also have the disadvantage of not being entirely suitable for balancing the rheological properties with the mechanical properties.
A composition of block copolymers has now been found, which overcomes the drawbacks described above.
REFERENCES:
patent: 5627234 (1997-05-01), Giordano et al.
patent: 5705556 (1998-01-01), Dijauw et al.
Cavallo Claudio
Custro Sergio
Viola Gian Tommaso
Asinovsky Olga
Enichem S.p.A.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Seidleck James J.
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