Controlled-thermal-expansion layer system with very diverse uses, formed from composite of polymers and knitted fibrous materials, has adjustable thermal expansion in x, y and z layers

• Main Authors: SAPICH, GUDRUN, DREYER, CHRISTIAN, BAUER, MONIKA
• Format: Patent
• Language: English; German
• Published: 23.06.2005
• Edition: 7
• Subjects: BRAIDING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES; INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTIOND, RELATING TOTEXTILES; KNITTING; LACE-MAKING; LAUNDERING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; NON-WOVEN FABRICS; PERFORMING OPERATIONS; TEXTILES; TRANSPORTING; TREATMENT OF TEXTILES OR THE LIKE; TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS; TRIMMINGS

The coefficient of thermal expansion of the laminate in the x-direction, y-direction and z-direction is adjustable : The laminate comprises layer(s) of prepregs pressed together, containing a plastic matrix and a fibrous material. Thermal expansion coefficients in the x and y directions are about equal; that in the z direction equals that in the y or the x or the x and y directions. Differences are limited to 0-5 ppm/K. The thermal expansion coefficient in the cited directions is preferably greater than 50 ppm/K. The fibrous material is a knit. It has high expansibility in the directions cited. It comprises a fiber made of glass, ceramic, carbon, metal, aramid, plastic, natural fibers or polyimide. At least two differing knitted layers are included. All layers in the laminate so formed, have knitting aligned in the same x, y directions. Adjacent layers are turned through the same angle. The matrix is a reactive resin, thermoplastic, cross-linked or non-cross linked elastomer. The matrix contains natural polymers, synthetic polymers and modified natural materials or their combinations. The knit has a knitted-in pattern. This is for identification, decoration and/or marking. In a particular application, a layer of polycarbonate is applied to the data storage layer. Additional functions are incorporated in the knit. The corresponding laminate is also claimed. Die vorliegende Erfindung betrifft faserverstärkte Kunststoffe, die eine Matrix aus einem Kunststoff und ein Fasermaterial enthalten. Diese faserverstärkten Kunststoffe weisen aufgrund einer entsprechenden Auswahl des Fasermaterials, insbesondere eines Gestrickes, thermische Ausdehnungskoeffizienten auf, die in x-Richtung, y-Richtung und z-Richtung einstellbar ist. Ein bevorzugtes Einsatzgebiet der erfindungsgemäßen faserverstärkten Kunststoffe liegt auf dem Gebiet der Mikroelektronik.