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Cheaper chopped strand for BMC
MATERIlit Gray valley launches DCPD resins A RANGE of dicyclopentadiene (DCPD)-based unsaturated polyester (UP) resins are being launched by French owned Cray Valley-Total. The resins are based on technology developed by Cray Valley’s sister company Cook Composites and Polymers (CCP) and used in the USA for the last 20 years. The resins reduce styrene emissions and have low water absorption, says Cray Valley. Philippe Marthet, of the polyester resin division, told Reinforced Plastics that DCPD of suitable quality for UP resin has only become available in recent years. The new resins, as yet unnamed, have styrene contents 3-7% below conventional orthophthalic UP, and reduce styrene emissions at all stages of the moulding process by up to 50%. This is achieved without the use of film forming additives. Average emissions during moulding are lo-12 parts per million (ppm). The resins also have good wetting properties. This reduces the time needed for rolling out, also helping to keep styrene emissions down. Higher glass and filler loadings are possible, says Marthet. DCPD modified UP also achieve Barcol hard-
ness more rapidly. The new resins are said to reach a demould hardness of 50 Barcol in 8 hours. A conventional UP would reach approximately 20 Barcol in the same ‘time, says Marthet. The rapid hardening permits moulds to be rotated faster, improving production efficiencies. Finally, the DCPD resins reduce shrinkage, reducing glass print through. Mechanical properties are similar to conventional UP. However, flexural properties after prolonged immersion in water are better, making the resin particularly suitable for marine applications. The resins will be produced in Drocourt, France, and Stallingborough, UK. Investment has been required to modify the production method, but resin prices will be the same as conventional orthophthalic UP. Cray Valley will formally launch the range at JEC. The resins will be available in France and the UK before the end of 1995. The company expects the customer reception to be good: processing and catalyst are the same as for conventional resins. Gray Valley; tel: + 33141-3568-84; fax: + 33141-3561- 18.
Cheaper chopped strand for BMC
Supplying Quality Colorant and Chemical Dispersions to the Plastics Industry.
Styrene update THE MAXIMUM concentration of styrene in the workplace, as shown in March 1995 Reinforced Plastics, page 33, has recently been amended.
Reinforced Plastics April 1995
Austria has reduced its level from 40 to 20 or 25 parts per million (ppm), and The Netherlands has reduced the concentration from 100 to 25 ppm.
can be used for either compression or injection moulding of parts used in automotive and electrical applications. Another introduction by the company is Star Rov 507. This is said to maximize the performance of phenolic pultrusions thanks to its good handling and wet-through characteristics. The direct wound roving was developed in close cooperation between a pultrusion processor, a phenolic resin manufacturer and Schuller International. Use of the product is said to yield parts with good production rates, smooth surface finish and high mechanical properties. Cheryl R. Roman, Schuller International; tel: + l-419-878- 1504.
A COST effective chopped strand reinforcement for use in bulk moulding compound (BMC) has been introduced by Schuller Mats & Reinforcements. Star Stran 706C is said to offer a functional performance without the economic penalty associated with secondarychopped products. It has a silane sizing treatment for compatibility with thermoset polyester resin. “Star Stran 706C was developed in response to a marketplace need for more cost effective reinforcement products”, says Cheryl Roman, sales manager for reinforcement products. “The pressure to contain the costs of goods sold to Detroit has been great. We developed 706C as a response to those pressures.” It
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ness more rapidly. The new resins are said to reach a demould hardness of 50 Barcol in 8 hours. A conventional UP would reach approximately 20 Barcol in the same ‘time, says Marthet. The rapid hardening permits moulds to be rotated faster, improving production efficiencies. Finally, the DCPD resins reduce shrinkage, reducing glass print through. Mechanical properties are similar to conventional UP. However, flexural properties after prolonged immersion in water are better, making the resin particularly suitable for marine applications. The resins will be produced in Drocourt, France, and Stallingborough, UK. Investment has been required to modify the production method, but resin prices will be the same as conventional orthophthalic UP. Cray Valley will formally launch the range at JEC. The resins will be available in France and the UK before the end of 1995. The company expects the customer reception to be good: processing and catalyst are the same as for conventional resins. Gray Valley; tel: + 33141-3568-84; fax: + 33141-3561- 18.
Cheaper chopped strand for BMC
Supplying Quality Colorant and Chemical Dispersions to the Plastics Industry.
Styrene update THE MAXIMUM concentration of styrene in the workplace, as shown in March 1995 Reinforced Plastics, page 33, has recently been amended.
Reinforced Plastics April 1995
Austria has reduced its level from 40 to 20 or 25 parts per million (ppm), and The Netherlands has reduced the concentration from 100 to 25 ppm.
can be used for either compression or injection moulding of parts used in automotive and electrical applications. Another introduction by the company is Star Rov 507. This is said to maximize the performance of phenolic pultrusions thanks to its good handling and wet-through characteristics. The direct wound roving was developed in close cooperation between a pultrusion processor, a phenolic resin manufacturer and Schuller International. Use of the product is said to yield parts with good production rates, smooth surface finish and high mechanical properties. Cheryl R. Roman, Schuller International; tel: + l-419-878- 1504.
A COST effective chopped strand reinforcement for use in bulk moulding compound (BMC) has been introduced by Schuller Mats & Reinforcements. Star Stran 706C is said to offer a functional performance without the economic penalty associated with secondarychopped products. It has a silane sizing treatment for compatibility with thermoset polyester resin. “Star Stran 706C was developed in response to a marketplace need for more cost effective reinforcement products”, says Cheryl Roman, sales manager for reinforcement products. “The pressure to contain the costs of goods sold to Detroit has been great. We developed 706C as a response to those pressures.” It
2600 Michigan Avenue l Ashtabula, Ohlo 44004 PO Box 816 l Ashtabula, Ohlo 44005-0816 TEL 216-997-5137 l FAX 216-992-3613
CIRCLE
013 ON ADVERTISING
RESPONSE
CARD