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US 4,053,674 AGranted
Glow-resistant batt and process for producing such
AssigneeFiberlok, Inc.
InventorsGeorge Sumner Buck, Jr., Robert George Weyker, Arthur Gerard Ward
Life of this patent
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Abstract
A glow-resistant batt of fibers; a copolymer of vinyl chloride and vinylidene chloride; and boric acid; and processes for producing such.
Claims10
A process for producing a batt comprising the steps of:
- I. forming a thin web of fibers;
- Ii. contacting the web with an adhesive amount of particles of a copolymer of vinyl chloride and vinylidene chloride;
- Iii. contacting the web with a glow-resistance imparting amount of boric acid;
- Iv. forming the web into a batt by laying the web transversely back and forth on a moving belt such that the batt comprises a plurality of webs;
- and
- V. heating the batt to a temperature above the sticking point of the copolymer but below the degredation point of the fibers
- wherein the weight ratio of vinyl chloride to vinylidene chloride is 1:99 to 40:60 and
- wherein the weight ratio of the copolymer to the fibers is 1:99 to 30:70 and
- wherein the copolymer particles have a size range of from 1 to 200 microns and
- wherein the weight ratio of copolymer to boric acid is 5:10 to 200:10.
7 more elements
A completely dry process for producing a batt of high compressive strength comprising in sequence the steps of:
- I. forming a horizontally disposed, thin, planar web of fibers;
- Ii. contacting the web with particles of a copolymer of vinyl chloride and vinylidene chloride in admixture with boric acid while the web is in contact with and supported by a moving belt thereby inhibiting the passage of particles through the web;
- A. wherein the weight ratio of vinyl chloride to vinylidene chloride is 5:95 to 25:75,
- B. wherein the weight ratio of the copolymer to the fibers is 10:90 to 20:80,
- C. wherein the copolymer particles have a size range of 5 microns to 50 microns,
- D. wherein the copolymer has a sticking point of 300.degree. to 370.degree. F.,
- E. wherein the boric acid comprises from 2 to 6 weight percent of the batt,
- F. wherein the weight ratio of copolymer to boric acid is 2:1 to 10:1,
- G. wherein the particles are fed from a container onto a first rotating member which is then contacted with a counter-rotating brush having bristles which remove the particles from the first rotating member permitting the particles to fall on the web under the influence of gravity,
- Iii. passing the web and adhering particles through the nip of two rotating rolls to impress the particles into the web;
- Iv. forming the web into a batt by laying the web transversely back and forth on a moving belt such that the batt comprises a plurality of webs;
- V. heating the batt to a temperature of 325.degree. to 375.degree. F. for a period of 2 to 10 minutes while the batt is being passed through an oven between two parallel foraminous belts while hot air is forced through the belts and through the batt;
- thereby providing a glow-resistant batt of high compressive strength.
10 more elements
A glow-resistant fibrous batt comprising:
- A. fibers bonded at their intersections by melted particles of a copolymer of vinyl chloride and vinylidene chloride
- wherein the weight ratio of vinyl chloride to vinylidene chloride is 1:99 to 40:60 and
- wherein the weight ratio of the copolymer to the fibers is 1:99 to 30:70 and
- wherein the copolymer particles have a size range of from 1 to 200 microns
- and;
- B. boric acid carried by the copolymer
- wherein the weight ratio of copolymer to boric acid is 5:10 to 200:10.
4 more elements
Dependencies are inferred from the claim text.