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US 7,683,155 B2Granted
Process for producing phenolic novolak
AssigneeAsahi Organic Chemicals Industry Col., Ltd.
InventorsShigeki Inatomi, Noboru Tanoue, Motoji Yokoyama, Hirofumi Shinohara, Satoshi Takehara
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Abstract
A phenolic novolak having the contents of a monomeric phenol and a dimeric phenol and a degree of dispersion controlled can be obtained in high yield by a process for production of a phenolic novolak having a step of conducting a heterogeneous reaction of a phenol and an aldehyde in the presence of a phosphoric acid and an unreactive oxygen-containing organic solvent as a reaction cosolvent.
Claims6
A process for production of a phenolic novolak, comprising:
- a step of conducting a heterogeneous reaction of a phenol and an aldehyde in the presence of a phosphoric acid and an unreactive oxygen-containing organic solvent as a reaction cosolvent,
- wherein the phosphoric acid is 25 parts by mass or more per 100 parts by mass of the phenol,
- wherein the reaction cosolvent is 5 to 200 parts by mass per 100 parts by mass of the phenol, and
- the heterogeneous reaction takes place between two liquid phases in a cloudy state caused by the mixing of an organic phase having the phenol as the main ingredient and a water phase having the phosphoric acid, the aldehyde and a reaction cosolvent as the main ingredients.
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Dependencies are inferred from the claim text.