# US 5,346,937 A · Modifying agents for thermosetting resins and thermosetting resins prepared using these agents > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,346,937 A - Document ID: US5346937A - Status: Granted - Kind: A - Application number: 08/074,548 - Filed: 1993-06-11 - Granted: 1994-09-13 - Earliest claimed: 1991-04-06 - Assignees: SKW Trostberg Aktiengesellschaft - Inventors: Josef Kuchler; Hans-Georg Erben; Josef Seeholzer - Web page: https://patentgrep.com/patent/US5346937A ## CPC - C08G 12/40: Chemically modified polycondensates - C08G 12/34: and acyclic or carbocyclic compounds - C08G 12/46: Block or graft polymers prepared by polycondensation of aldehydes or ketones on to macromolecular compounds - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS ## Abstract The present invention relates to modifying agents for melamine-formaldehyde resins and highly reactive thermosetting resins which are prepared with this agent and consist of 1 mol of melamine, 1.5 to 3.5 mol of formaldehyde, 0.5 to 5% by weight of a polyhydric alcohol, based on the melamine plus formaldehyde, and 0.5 to 10% by weight of the modifying agent, based on the liquid resin. The modifying agent can be added to the melamine-formaldehyde resin as a pulverulent mixture before or during the condensation reaction or in the liquid state in the form of a condensation product prepared in a known manner. The modifying agent consists of 10 to 75% by weight of dicyandiamide, 5 to 70% by weight of cold water-soluble starch (soluble between about 18.degree. and about 25.degree. C.) and 20 to 85% by weight of a guanamine. The highly reactive resins modified in this way are preferably used for coating chipboard and hardboard by a short cycle process. ## Claims ### Claim 1 A process for the manufacture of a modified melamine-formaldehyde resin comprising: subjecting the following to an aqueous condensation reaction, by combining: 1 mol of melamine; 1.5 to 3.5 mol of formaldehyde; 0.5 to 5% by weight of a polyhydric alcohol based on melamine plus formaldehyde; and, 0.5 to 10% by weight of a modifying agent based on the weight of the melamine and formaldehyde wherein said condensation reaction is at a pH of about 7.5 to about 10 and a temperature of about 70.degree. to about 100.degree. C. up to a water-dilutability of 1:1.0 to 2.0 and wherein said polyhydric alcohol is selected from the group consisting of ethylene glycol, diethylene glycol, dipropylene glycol, diisopropylene glycol, dibutylene glycol, di-tert-butylene glycol and ethylene propyl glycol and wherein said modifying agent comprises: a) 10 to 75% by weight of dicyandiamide; b) 5 to 70% by weight of cold water soluble starch which is soluble at about 18.degree. to about 25.degree. C.; and, c) 20 to 85% by weight of a guanamine of the general formula ##STR2## wherein R is a radical selected from the group consisting of methyl, phenyl, and phenyl substituted by an alkyl group. ### Claim 2 (depends on 1) The process of claim 1 wherein said cold water-soluble starch is a potato starch which is soluble at about 18.degree. to about 25.degree.. ### Claim 3 (depends on 1) Process according to claim 1 wherein said guanamine is a benzoguanamine. ### Claim 4 (depends on 1) Process according to claim 1 wherein said guanamine is an acetoguanamine. ### Claim 5 (depends on 1) The process of claim 1 wherein said modified melamine-formaldehyde resin is a laminate resin. ### Claim 6 (depends on 5) The process of claim 5 wherein said laminate resin is a continuous process laminate resin. ### Claim 7 A process for the manufacture of a modified melamine-formaldehyde resin comprising: subjecting the following to a condensation reaction, by combining: 1 mol of melamine; 1.5 to 3.5 mol of formaldehyde; and, 0.5 to 5% by-weight of a polyhydric alcohol based on melamine plus formaldehyde, wherein said condensation reaction is at a pH of 7.5 to 10 and a temperature of 70 to 100 degrees centigrade up to a water-dilutability of 1:1.0 to 2.0, and then 0. 5 to 10% by weight of a modifying agent is added based on the weight of the melamine and formaldehyde wherein said modifying agent is a condensation product of 200 to 300 parts by weight of formaldehyde solution and 100 to 150 parts by weight of a mixture of 10 to 75% by weight of dicyandiamide; 5 to 70% by weight of cold water-soluble starch which is soluble at a temperature of about 18.degree. C. to about 25.degree. C.; and, 20to 85% by weight of acetoguanamine. ### Claim 8 (depends on 7) The process according to claim 7 wherein said cold water soluble starch is potato starch which is soluble between about 18.degree. and about 25.degree.. ### Claim 9 (depends on 7) The process of claim 7 wherein said modified melamine-formaldehyde resin is a laminate resin. ### Claim 10 (depends on 9) The process of claim 9 wherein laminate resin is a continuous process laminate resin. ### Claim 11 A process for the manufacture of a modified melamine-formaldehyde resin comprising: subjecting the following to an aqueous condensation reaction, by combining: 1 mol of melamine; 1.5 to 3.5 mol of formaldehyde; 0.5 to 5% by weight of a polyhydric alcohol based on melamine plus formaldehyde; and, 0.5 to 10% by weight of a modifying agent based on the weight of the melamine and formaldehyde wherein said condensation reaction is at a pH of about 7.5 to about 10 and a temperature of about 70.degree. to about 100.degree. C. up to a water-dilutability of 1:1.0 to 2.0 and wherein said polyhydric alcohol is selected from the group consisting of ethylene glycol, diethylene glycol, dipropylene glycol, diisopropylene glycol, dibutylene glycol, di-tert-butylene glycol and ethylene propyl glycol and wherein said modifying agent comprises: a) 10 to 70% by weight of dicyandiamide; b) 5 to 70% by weight of cold water soluble starch which is soluble at about 18.degree. to about 25.degree. C.; and, c) 20 to 85% by weight of a guanamine compound. ### Claim 12 (depends on 11) The process of claim 11 wherein said cold water soluble starch is a potato starch which is soluble at about 18.degree. to about 25.degree. c. ### Claim 13 (depends on 11) Process according to claim 11 wherein said guanamine is a benzoguanamine. ### Claim 14 (depends on 11) Process according to claim 11 wherein said guanamine is an acetoguanamine. ### Claim 15 (depends on 11) The process of claim 11 wherein said modified melamine-formaldehyde resin is a laminate resin. ### Claim 16 (depends on 15) The process of claim 15 wherein said laminate resin is a continuous process laminate resin.