Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Reexamination Certificate
2011-03-01
2011-03-01
Sergent, Rabon (Department: 1765)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
C252S182180, C252S182230, C525S454000, C525S455000, C528S069000, C528S075000, C560S025000, C560S026000, C560S115000, C560S158000
Reexamination Certificate
active
07897718
ABSTRACT:
The present invention relates to an acrylated semi-crystalline hyperbranched polyurethane oligomer and a preparation method thereof, which is characterized in that on the basis of the synthesis of hyperbranched polyurethane oligomer, it adopts a two-step process to make modifications to form a methacrylic and/or acrylic double bond and a long carbon chain with a carbon atom number higher than 10 or a benzene ring or a naphthalene ring at the terminals. The obtained oligomer has a lower melting point and a higher glass transition temperature and can be cured by means of radiation, and the curing rate is high enough to effectively improve production efficiency and save energy to form a cured film having a higher hardness and excellent thermal stability. The raw materials used in the method of the invention are easily obtained, and the method is suitable for large-scale production in industry.
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Chang Chi-Kang
Chen Chin-Yuan
Liang Hong-Bo
Shi Wen-Fang
Eternal Chemical Co., Ltd.
Garabedian Todd E.
Sergent Rabon
Wiggin and Dana LLP
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