Breakable crosslinkers an use for preparation of polymers...

Details Breakable crosslinkers an use for preparation of polymers... Breakable crosslinkers an use for preparation of polymers...

2000-11-14

2001-11-27

Seidleck, James J. (Department: 1711)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C526S321000, C526S323100, C526S323200, C526S329600, C524S557000, C524S561000

Reexamination Certificate

active

06323360

ABSTRACT:

FIELD OF INVENTION
The present invention relates generally to polymers. More particularly, the present invention provides novel cross-linkers for the preparation of star-shaped or branched polymers and polymer gels.
DISCUSSION OF RELATED ART
Divinyl cross-linking reagents (crosslinkers) have often been employed for the preparation of star-shaped (co)polymers. For example a linear living polymer has been prepared using a living polymerization technique, followed by the reaction of its living end with a small amount of divinyl compound. The addition of divinyl benzene (DVB) to an anionic living polystyrene [poly(St)] solution led to the formation of a star-shaped poly(St) with a central poly(DVB) gel. This method has also been extended to cationic, group transfer and metathesis polymerizations (all of these methods are well known to those skilled in the art) in which divinyl ethers, divinyl esters and norbornadiene dimers were used as crosslinkers, respectively. This synthetic technique is carried out by adding a bifunctional monomer to a completed living polymerization system.
SUMMARY OF THE INVENTION
The present invention discloses the synthesis of a novel crosslinker having the following structure:
R
1
is C(R
8
) (R
9
)wherein (R
8
) is H, or an alkyl group having 1-5 carbon atoms, and (R
9
) is H, or an alkyl group having 1-5 carbon atoms. R
2
is H, or an alkyl group having 1-5 carbon atoms. R
3
is H or an alkyl group having 1-5 carbon atoms. R
4
is an alkyl group having 1-5 carbon atoms. R
5
is H or an alkyl group having 1-5 carbon atoms. R
6
is H or an alkyl group having 1-5 carbon atoms. R
7
is C(R
10
) (R
11
)wherein (R
10
) is H, or an alkyl group having 1-5 carbon atoms, and (R
11
) is H, or an alkyl group having 1-5 carbon atoms. The crosslinker is stable in a basic environment, but decomposable in an acidic environment.


REFERENCES:
patent: 2889192 (1959-06-01), D'Adamo et al.
patent: 881 102 (1961-11-01), None

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