Heat seamable flame retardant roof sheeting with highly crystalline thermoplasticity promoters and method for covering roofs

• US 5,516,829 A
• Filed: 08/10/1992
• Issued: 05/14/1996
• Est. Priority Date: 08/10/1992
• Status: Expired due to Fees

• Current Assignee: BFS Diversified Products LLC (Bridgestone Corporation)
• Original Assignee: Bridgestone Corporation
• Inventors: Davis, James A., Valaitis, Joseph K.
• Primary Examiner(s): Michl, Paul R.
• Assistant Examiner(s): CAIN, EDWARD J
• Application Number:
  US07/926,737
• Time in Patent Office: 1,373 Days
• Field of Search: 524/411, 524/495, 524/505, 524/515, 524/519, 525/209, 525/213, 525/214, 525/239, 525/240, 525/95, 525/88
• US Class Current: 524/411
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08L 23/28 by reaction with halogens or compounds containing halogen C08L23/32 takes precedence
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: E04D 5/06 by making use of plastics

Abstract

A heat seamable flame retardant 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 50 to 90 parts by weight of halogenated 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 10 to 50 parts by weight of a highly crystalline thermoplasticity promoter selected from the group consisting of polymeric olefins prepared from monomers consisting of at least two carbon atoms; from about 50 to 250 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; from about 20 to 105 parts by weight of a processing material and mixtures thereof, per 100 parts of the polymer blend; and from about 15 to 90 parts by weight of an additive selected from the group consisting of flame retardant materials and mixtures thereof, per 100 parts of the polymer blend. A method for covering a roof comprises the steps of applying layers of sheet material as described above to the roof being covered; overlapping adjacent edges of the layers; heating the overlapped areas to slightly above the softening point of the sheet material and seaming the overlapped areas using heat and sufficient pressure to provide an acceptable seam, the composition of matter having sufficient self-adhesion without the use of an adhesive.

Claims

1. A heat seamable flame retardant sheet for roofing prepared from an uncured polymeric composition of matter consisting essentially of:

100 parts by weight of a polymer blend consisting essentially of

from about 50 to 90 parts by weight of a halogenated olefinic elastomer selected from the group consisting of halogenated polyolefins having up to about 2 percent by weight crystallinity, said polyolefins being prepared from monomers having at least 2 carbon atoms and mixtures thereof; and

from about 10 to 50 parts by weight of a highly crystalline thermoplasticity promoter selected from the group consisting of polyolefin polymers prepared from monomers containing at least two carbon atoms;

from about 50 to 250 parts by weight of a filler selected from the group

consisting of reinforcing and non-reinforcing materials and mixtures thereof, per 100 parts of said polymer blend;

from about 20 to 105 parts by weight of a processing material and mixtures thereof, per 100 parts of said polymer blend; and

from about 15 to 90 parts by weight of an additive selected from the group consisting of flame retardant materials and mixtures thereof, per 100 parts of said polymer blend.

2. A heat seamable flame retardant sheet material, as set forth in claim 1, wherein said halogenated olefinic elastomer is selected from the group consisting of chlorinated and brominated ethylene-propylene and ethylene-butene copolymers.

3. A heat seamable flame retardant sheet material, as set forth in claim 2, wherein said filler comprises about 110 parts by weight of carbon black;

said composition of matter includes about 55 parts by weight of processing oil; and

said additive includes a mixture of about 5 parts by weight of antimony trioxide and about 5 parts by weight of liquid chlorinated paraffin.

4. A heat seamable flame retardant sheet material, as set forth in claim 1, wherein said thermoplasticity promoter comprises 50 parts by weight of high density polyethylene and exhibits a limited oxygen index performance of about 23.6 percent oxygen.

5. A method for covering a roof with a heat seamable flame retardant sheet material for roofing prepared from an uncured polymeric composition of matter comprising the steps of:

applying layers of self-adhering sheet material prepared from an uncured heat seamable flame retardant polymeric composition of matter consisting essentially of

100 parts by weight of a polymer blend consisting essentially of

from about 50 to 90 parts by weight of a halogenated olefinic elastomer selected from the group consisting of halogenated polyolefins having up to about 2 percent by weight crystallinity, said polyolefins being prepared from monomers having at least 2 carbon atoms and mixtures thereof; and

from about 10 to 50 parts by weight of a highly crystalline thermoplasticity promoter selected from the group consisting of polyolefin polymers prepared from monomers containing at least two carbon atoms;

from about 50 to 250 parts by weight of a filler selected from the group consisting of reinforcing and non-reinforcing materials and mixtures thereof, per 100 parts of said polymer blend;

from about 20 to 105 parts by weight of a processing material and mixtures thereof, per 100 parts by weight of said polymer blend; and

from about 15 to 90 parts by weight of an additive selected from the group consisting of flame retardant materials and mixtures thereof,

per 100 parts of said polymer blend, to the roof being covered;

overlapping adjacent edges of said layers;

heating the overlapped areas to slightly above the softening point of the sheet material and

seaming the overlapped areas using heat and under sufficient pressure to provide an acceptable seam strength, said composition of matter having sufficient self-adhesion without the use of an adhesive.

6. A method, as set forth in claim 5, wherein the step of heating is conducted under a temperature of at least about 82°

C.

7. A method, as set forth in claim 5, wherein said filler comprises about 110 parts by weight of carbon black, said composition of matter includes about 55 parts by weight of processing oil, and said additive includes a mixture of about 5 parts by weight of antimony trioxide and about 5 parts by weight liquid chlorinated paraffin.