FIELD: chemistry.
SUBSTANCE: co-oligophenol-formaldehyde novolacs have a general formula 
where R=H; C6H5, n=5-8, m=1, (p+k):m=0,01-0,2, p:k=0.8 or 1. The method of producing the novolacs includes reacting phenol, 3,3-bis(4'-hydroxyphenyl)phthalide, 3,3-bis(4'-hydroxyphenyl)phthalimidine or 2-phenyl-3,3-bis(4'-hydroxyphenyl)phthalimidine, in weight ratio of 60:20:20 to 97:1.5:1.5, with formaldehyde. The molar ratio of the mixture of said components and formaldehyde is equal to 1:0.7. The reaction is carried out at 80-85°C in an aqueous solution in the presence of acid catalysts selected from a group comprising hydrochloric acid, phosphoric acid and oxalic acid. Crosslinked copolymers are obtained when said novolacs are cured.
EFFECT: invention enables to obtain novolacs which are stable during storage and processing, and considerably increases heat-resistance of the copolymers and strength properties thereof.
4 cl, 1 dwg, 3 tbl, 20 ex
| Title |
Year |
Author |
Number |
| COOLIGOPHENOL-FORMALDEHYDE PHTHALIMIDINE-CONTAINING NOVOLACS FOR PRODUCING CROSS-LINKED PHTHALIMIDINE-CONTAINING COPOLYMERS, METHOD FOR PRODUCTION THEREOF AND CROSS-LINKED PHATHALIMIDINE-CONTAINING COPOLYMERS AS ENGINEERING POLYMERS |
2012 |
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- Salazkin Sergej Nikolaevich
- Nechaev Aleksandr Igorevich
|
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2010 |
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- Salazkin Sergej Nikolaevich
- Nechaev Aleksandr Igorevich
|
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2014 |
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- Salazkin Sergei Nikolaevich
- Donetskaya Svetlana Aleksandrovna
- Nechaev Aleksandr Igorevich
|
RU2549834C1 |
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2010 |
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|
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2013 |
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|
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2011 |
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|
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2010 |
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|
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2006 |
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|
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| PHENOL FORMALDEHYDE NOVOLAC-TYPE COOLIGOMERS, METHOD FOR PRODUCTION THEREOF AND CROSS-LINKED COPOLYMERS BASED THEREON |
2016 |
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|
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2016 |
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