- Email: [email protected]
RAPRA research study on continuous fibres
October 1991
Additives for Polymers
TECHNICAL Coated calcium carbonate in BMC
NOTES
In order to achieve a Class A surface and zero shrinkage in bulk moulding compounds containing calcium carbonate, it is necessary to add a low profile additive (polymer dissolved in styrene) to the compound. However, these additives can create large, ~m~spersed voids in the BMC which tend to scatter light, causing a non-uniform colour appearance in pigmented compounds (whitening). ECC America Inc., of Atlanta, GA, a supplier of calcium carbonate, claims it has technology to overcome these limitations. The company does this by applying a thermoplastic coating to the calcium carbonate surface. ECC claims that its natural white POIARITE 420 G(W) yields a more uniform colour and smoother surface than can be achieved on conventional products.
Rheological additives in latex paints
Application properties of latex paints rely on the use of rheological additives and modifiers to a much greater extent than their solvent-based counterparts. Depending on the properties desired for a given end use market, a typical latex paint may contain up to four rheological additives. Typically a combination of additives is used to provide a good balance of container viscosity, application viscosity, antisettling properties, spatter resistance, flow and levelling. Often, a combination of two or more of cellulosic, polyac~la~, clay, and associative thickeners is used to provide the rheological profile required for a specific paint application. This paper discusses the rheological behaviour of each class of water based rheological additive and its contribution to the final performance properties of a latex paint. Poly. Paint Cal. J., 1991, 181, (June 261, 372-5
RAPRA research study on continuous fibres
IXAPRAin the UK (The Rubber and Plastics Research Association) is carrying out a multi-client survey to investigate the competing technologies in the field of continuous fibrereinforced products. It involves a comprehensive analysis of the technologies in use and under development, the products which can be produced by these and the market trends for them, the state of the art of com~ting ~~olo~es such as gIass, metaI, and ceramics, and the impact of environmental pressures and legislation. The project started in June, and will end with a client conference in February, 1992. The report will cost from 334,250to &3,000, depending on date of joining. Interested parties are invited to contact: Dr. Peter Duftont Rapra Technology, Shuwbury, Shrewubury, SY4 4NR, (UKj. Tel: +44-939-250383.
01991 Elsevier Science Publishers Ltd.
Additives for Polymers
TECHNICAL Coated calcium carbonate in BMC
NOTES
In order to achieve a Class A surface and zero shrinkage in bulk moulding compounds containing calcium carbonate, it is necessary to add a low profile additive (polymer dissolved in styrene) to the compound. However, these additives can create large, ~m~spersed voids in the BMC which tend to scatter light, causing a non-uniform colour appearance in pigmented compounds (whitening). ECC America Inc., of Atlanta, GA, a supplier of calcium carbonate, claims it has technology to overcome these limitations. The company does this by applying a thermoplastic coating to the calcium carbonate surface. ECC claims that its natural white POIARITE 420 G(W) yields a more uniform colour and smoother surface than can be achieved on conventional products.
Rheological additives in latex paints
Application properties of latex paints rely on the use of rheological additives and modifiers to a much greater extent than their solvent-based counterparts. Depending on the properties desired for a given end use market, a typical latex paint may contain up to four rheological additives. Typically a combination of additives is used to provide a good balance of container viscosity, application viscosity, antisettling properties, spatter resistance, flow and levelling. Often, a combination of two or more of cellulosic, polyac~la~, clay, and associative thickeners is used to provide the rheological profile required for a specific paint application. This paper discusses the rheological behaviour of each class of water based rheological additive and its contribution to the final performance properties of a latex paint. Poly. Paint Cal. J., 1991, 181, (June 261, 372-5
RAPRA research study on continuous fibres
IXAPRAin the UK (The Rubber and Plastics Research Association) is carrying out a multi-client survey to investigate the competing technologies in the field of continuous fibrereinforced products. It involves a comprehensive analysis of the technologies in use and under development, the products which can be produced by these and the market trends for them, the state of the art of com~ting ~~olo~es such as gIass, metaI, and ceramics, and the impact of environmental pressures and legislation. The project started in June, and will end with a client conference in February, 1992. The report will cost from 334,250to &3,000, depending on date of joining. Interested parties are invited to contact: Dr. Peter Duftont Rapra Technology, Shuwbury, Shrewubury, SY4 4NR, (UKj. Tel: +44-939-250383.
01991 Elsevier Science Publishers Ltd.