Polymer blends for heat seamable roof sheeting

Details Polymer blends for heat seamable roof sheeting Polymer blends for heat seamable roof sheeting

1992-04-06

1994-02-15

Lesmes, George F.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525232, 524495, 428290, C08K 300, C08L 2316

Patent

active

052867986

ABSTRACT:
A self-adhering heat seamable sheet material for roofing prepared from an uncured polymeric composition of matter which comprises 100 parts by weight of a polymer blend comprising from about 10 to 95 parts by weight of an polymer selected from the group consisting of semi-crystalline polymers having more than about 2 percent be weight crystallinity and polyolefins having up to about 2 percent by weight crystallinity, which polyolefins are prepared from monomers having at least 2 carbon atoms, and mixtures thereof; and from about 5 to 90 parts by weight of a crystallinity enhancing polymer and mixtures thereof; from about 20 to 300 parts by weight of a filler selected from the group consisting of reinforcing and non-reinforcing materials and mixtures thereof per 100 parts of the polymer blend; and from about 20 to 150 parts by weight of a processing material and mixtures thereof, per 100 parts of the polymer blend. A method for covering a roof comprises the steps of applying layers of self-adhering sheet material prepared from an uncured heat seamable polymeric composition of matter comprising blends of polyolefins, semi-crystalline polyolefins and crystallinity enhancing polymers to the roof being covered; overlapping adjacent edges of the layers; heating the overlapped areas to about the softening point of the sheet material and seaming the overlapped areas under sufficient pressure to provide an acceptable seam strength. For practice of the method, the composition of matter is self-adhering, without the use of an adhesive.

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"Rubber-Theromplastic Compositions. Part V. Selecting Polymers For Thermoplastic Vulcanizates", Rubber Chem. Technol., p. 116, vol. 55.
European Search Report, Jul. 20, 1993.

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