Staged condensation, dynamic vulcanization process for making a

Details Staged condensation, dynamic vulcanization process for making a Staged condensation, dynamic vulcanization process for making a

1998-05-22

1999-12-21

Moore, Margaret G.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525176, 525179, 525182, 525183, 525194, C08L 3308

Patent

active

060050527

ABSTRACT:
This invention describes a staged process in which successive dynamic vulcanizations of plural curable rubber blend components are based on condensation reactions of a functional group (reactive site) carried by each curable rubber. The process is carried out in three stages during each of which gases evolved during the condensation reactions are removed. It is essential to form an intermediate fully dense hard blend in the second stage. This intermediate hard blend contains a relatively large amount of plastic (relative to curable rubbers) and is therefore much harder than the desired final blend. In the third stage, additional rubber and curative for uncured rubber are added to achieve the desired softness. This process, carried out in an extruder, results in fully dense pellets which are injection moulded to produce articles having essentially the same specific gravity as that of the pellets.

REFERENCES:
patent: 5589544 (1996-12-01), Horrion
patent: 5777033 (1998-07-01), Venkataswamy et al.
patent: 5783631 (1998-07-01), Venkataswamy

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