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Palmer Holland, Inc.

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9 Products found on Palmer Holland, Inc.

CYMEL® 325 banner
Palmer Holland, Inc. company logo
Palmer Holland, Inc.CYMEL® 325
  • Principal:allnex Crosslinkers
  • Functions:Crosslinking Agent
  • Chemical Family:Chemical Mixtures & Blends
  • Compatible Polymers & Resins:Acrylics, Alkyds, Cellulose & Cellulosics, Epoxies (EP), Polyesters
  • End Uses:Enamel, Solventless & High Solids Coating, Surface Coating, Waterborne Coating
CYMEL® 325 is a new type of highly methylated melamine-formaldehyde resin which does not require strong acid catalyst for fast cure response. CYMEL® 325 is reactive with hydroxyl amide and carboxyl group containing polymers. The weight loss of CYMEL® 325 during the baking process is significantly less than that of partially methylated melamine-formaldehyde resins. The baking volatiles from CYMEL® 325 contain very low levels of formaldehyde. The lower weight loss of CYMEL® 325 crosslinked coatings also results in less tendency to blister at higher film thickness. CYMEL® 325 requires only weak acid catalysis for cure; a low acid number in the backbone resin is suffi- cient. The cure reaction additionally can be catalyzed with weak organic acids or inorganic acids such as maleic, citric, phosphoric or alkyl phosphoric acids, low levels of p-toluene sulfonic acid or CYCAT® 14040 catalyst. CYMEL® 325 will self-condense like a partially methylated resin. Higher film hardness may, therefore, be obtained by raising the level of amino crosslinking agent. The high reaction rate of CYMEL® 325 at lower temperature reduces the chance of evaporation of low molecular weight resin components. CYMEL® 325 should, therefore, be very suitable for applications where "smoking" of the baking exhaust is a problem. Compared to partially methylated melamine-formalde- hyde resins, CYMEL® 325has shown, in some water-reducible coatings, improved humidity and salt- spray resistance. CYMEL 325 resin is FDA approved under section 121.2514 and 121.2526.