Molding resins using renewable resource component
View Patent ↗Unsaturated polyester compositions are disclosed that are obtainable by reacting: (i) plant and animal oil triglycerides, an alkyl ester of a saturated or unsaturated fatty acid or mixtures thereof; (ii) a difunctional, or polyfunctional glycol or mixtures thereof; (iii) a difunctional or polyfunctional acid, their anhydrides or alkyl esters and mixtures thereof; (iv) a strained cycloolefin; (v) a component(s) that function as a compound capable of initiating polymerization at high temperature and which is stable at room temperature; and (vi) low profile additives, fillers, and reinforcements. Also disclosed are methods for the preparation of the polyesters and the use of the polyesters in closed and open mold compositions such as sheet molding compound (SMC), bulk molding compounding (BMC), resin transfer molding (RTM), pultrusion, infusion, filament winding, and spray up.
1. A molding resin composition comprising:
(a) an unsaturated polyester comprising a plant triglyceride or animal triglyceride, a polyhydric alcohol, an acid or acid anhydride, and a strained cycloolefin; and
(b) a free radical nitroxyl oxide compound capable of initiating polymerization at high temperature and is stable at room temperature.
2. The composition of claim 1 , wherein said composition contains 20 to 95 percent by weight of said unsaturated polyester.
3. The composition of claim 2 , wherein said composition contains 20 to 50 percent by weight of said unsaturated polyester of which 0.5 to 50 percent by weight is plant triglycerides or animal triglycerides, 10 to 50 percent by weight is polyhydric alcohol, 10 to 50 percent by weight is acid or acid anhydride, and 1 to 25 percent by weight is strained cycloolefin.
4. The composition of claim 1 , wherein said plant or animal triglyceride comprises a plant triglyceride.
5. The composition of claim 4 , wherein said plant triglyceride comprises an oil selected from the group consisting of: soy oil, corn oil, and rapeseed oil.
6. The composition of claim 1 , wherein said composition comprises 10 to 50 percent by weight of said polyhydric alcohol.
7. The composition of claim 1 , wherein said composition comprises 10 to 50 percent by weight of said acid or acid anhydride.
8. The composition of claim 1 , wherein said composition comprises 1 to 25 percent by weight of said strained cycloolefin.
9. The composition of claim 1 , wherein said strained cycloolefin comprises dicyclopentadiene.
10. The composition of claim 1 , wherein said nitroxide compound comprises 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy.
11. The composition of claim 1 , further comprising a low profile agent.
12. The composition of claim 1 , further comprising one or more additives selected from the group consisting of fiber reinforcers, antioxidants, solvents, polymerization inhibitors, chain transfer agents, fillers, thickening agents, flow agents, polymerization accelerators, lubricants, air release agents, wetting agents, UV stabilizers, compatibilizers, fire retardants, urethane reaction catalysts, moisture scavengers, and shrink-reducing additives.