UST994004I4 - Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbamates using solid acid catalysts - Google Patents

Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbamates using solid acid catalysts Download PDF

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Publication number
UST994004I4
UST994004I4 US06/069,005 US6900579A UST994004I4 US T994004 I4 UST994004 I4 US T994004I4 US 6900579 A US6900579 A US 6900579A US T994004 I4 UST994004 I4 US T994004I4
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United States
Prior art keywords
polymethylene polyphenyl
preparation
solid acid
acid catalysts
diphenylmethane dicarbamates
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US06/069,005
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Edward T. Shawl
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Abstract

Diphenylmethane dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the condensation of N-aryl carbamic acid esters, such as ethylphenylcarbamate, with formaldehyde, para-formaldehyde or trioxane in the presence of strongly acidic sulfonated aromatic ion exchange resins or perfluoroalkane sulfonic acid resins, at temperatures of from ambient to about 150° C. and optionally in the presence of an inert solvent.
US06/069,005 1979-02-01 1979-08-23 Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbamates using solid acid catalysts Pending UST994004I4 (en)

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Application Number Priority Date Filing Date Title
US06/069,005 UST994004I4 (en) 1979-02-01 1979-08-23 Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbamates using solid acid catalysts

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US830779A 1979-02-01 1979-02-01
US06/069,005 UST994004I4 (en) 1979-02-01 1979-08-23 Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbamates using solid acid catalysts

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US830779A Continuation 1979-02-01 1979-02-01

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UST994004I4 true UST994004I4 (en) 1980-05-06

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US06/069,005 Pending UST994004I4 (en) 1979-02-01 1979-08-23 Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbamates using solid acid catalysts

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027330A1 (en) * 1979-10-01 1981-04-22 Mitsubishi Kasei Corporation Process for the production of methylenedicarbanilates and the compounds thus obtained
US4303794A (en) 1980-12-22 1981-12-01 The Dow Chemical Company Separation and recovery of 4,4'-methylene dimethyl diphenyldicarbamate
US4543419A (en) 1981-02-25 1985-09-24 Atlantic Richfield Company Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbamates

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027330A1 (en) * 1979-10-01 1981-04-22 Mitsubishi Kasei Corporation Process for the production of methylenedicarbanilates and the compounds thus obtained
US4476317A (en) 1979-10-01 1984-10-09 Mitsubishi Chemical Industries Limited Process for the production of methylenedicarbanilates
US4303794A (en) 1980-12-22 1981-12-01 The Dow Chemical Company Separation and recovery of 4,4'-methylene dimethyl diphenyldicarbamate
US4543419A (en) 1981-02-25 1985-09-24 Atlantic Richfield Company Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbamates

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