C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
154/122, 400/942
C08K 7/14 (2006.01) B32B 5/16 (2006.01) B32B 27/18 (2006.01) C08K 3/32 (2006.01)
Patent
CA 2023352
ABSTRACT OF THE DISCLOSURE Impact resistant and flame retardant polymer composition, slab-like rectangular solid made of said composition, and composite laminate article having at least one layer of said composition. Composition is preferentially compression molded using a blended particulate feed of relatively high bulk. The polymer composition comprises a maximum of 86 volume percent of ultra high molecular weight polyethylene (UHMWPE), a minimum of 8 volume percent of a flame retardant additive or mixture thereof, and a minimum of 6 volume percent of chopped reinforcing fibers, all volumes referring to the densified (molded) state. In addition the bulk volume of the chopped reinforcing fibers, as measured by a tapped density test, must be a minimum of 27 percent of the final molded volume of the composition (BVPF equal to or greater than 27). The maximum volume % loading of the additives is limited by the requirement that the notched Izod impact strength is a minimum of 7 ft.-lb per inch width. The preferred flame retardant additive is essentially a water insoluble form of ammonium polyphosphate having a water solubility not exceeding 1 gram per 100 grams of water, and the preferred reinforcing fibers are chopped glass fibers about 1/8 to 1/4" inch in length. A significant flame retardant improvement without sacrifice in impact strength is achieved if a thin compressible non-woven fiberglass veil is applied to the top of the particulate feed prior to molding the slab-like solid. The composite layer has first and third layers of essentially rigid compounded high molecular polymers above described, and a second or middle elastomer layer, which is also preferentially flame retarded.
Glover Richard August
Orndorff Roy Lee Jr.
Srail Raymond Charles
Glover Richard August
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Orndorff Roy Lee Jr.
Srail Raymond Charles
The B.f. Goodrich Company
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