Inquiry (采购产品): Hot melt formulator To Whom It May Concern: Hair & Compounds Inc. is looking for a hot melt polyamide adhesive for bonding natural hair extensions. The adhesive must have excellent bond strength to natural hair and resistance to hot water, shampoo, and general hair care processes for a period of at least 3 months. Hair & Compounds and others have found by experience that polyamide hot melt adhesives are the only type of hot melts that provide this degree of durability. However, there are many polyamide formulations available. It is also necessary that the hot melt set very quickly with little hot tack. Quick set is required to enable fast processing with conventional hot melt equipment. The low degree of tack is necessary so that the adhesive will not stick to the hairdresser’s fingers or to adjacent (unwanted) strands of hair. The relatively low degree of hot tack and the fast set speed observed with the “desired” product appear to be unusual for a typical polyamide hot melt adhesive. Conventional application temperatures for polyamide adhesives and melt viscosities appear to be appropriate for the application. However, high melt viscosity (to prevent oozing or misapplied adhesive) and lower application temperature are desired. TGA and DSC curves for a “conventional” polyamide and for a “desired” polyamide are attached. A product showing properties comparable to the “desired” product is believed to be the best candidate for this application. The following assumptions have been made. However, others may interpret them differently, and all interpretations are welcome. From the TGA analysis: 1. It is believed that the high melt viscosity and low degree of hot tack may be due to a moderate filler loading (5% by weight) of an inorganic or high temperature organic substance in the “desired” product. 2. It is believed that the fast set time may be due to plasticizer or another organic compound in the formulation as evident from the early weight loss at lower temperatures. From the DSC analysis: 1. Both “conventional” and “desired” products have similar melt temperatures (120°C); however, the “desired product appears to have a higher glass transition temperature. This is, perhaps, another reason for low hot tack and fast set. **** Hidden Message ***** Elizabeth Dirks 7820 Burnet Ave. Van Nuys, CA 91405 USA Company: Hair and Compounds Title: Owner Phone: 818-997-8810 Fax: 818-997-8860 E-mail: isaac@haircompounds.com **** Hidden Message ***** isaac@haircompounds.com
