US2301452A - Pulp composition and paper - Google Patents

Pulp composition and paper Download PDF

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Publication number
US2301452A
US2301452A US343095A US34309540A US2301452A US 2301452 A US2301452 A US 2301452A US 343095 A US343095 A US 343095A US 34309540 A US34309540 A US 34309540A US 2301452 A US2301452 A US 2301452A
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US
United States
Prior art keywords
paper
age
sulfite
deterrent
filler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US343095A
Inventor
Joseph E Plumstead
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
West Virginia Pulp and Paper Co
Original Assignee
West Virginia Pulp and Paper Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US561241A external-priority patent/US2235531A/en
Application filed by West Virginia Pulp and Paper Co filed Critical West Virginia Pulp and Paper Co
Priority to US343095A priority Critical patent/US2301452A/en
Application granted granted Critical
Publication of US2301452A publication Critical patent/US2301452A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values

Definitions

  • This invention relates to an improved pulp composition and to paper formed therefrom.
  • the present application is a division of my copending application Ser. No. 561,241 filed September 4, 1931, now Patent No. 2,235,531 granted March 18, 1941. In said parent case there are disclosed and claimed methods of producing certain pigment or filler materials.
  • the invention embraced by the present application relates to a pulp mixture containing mechanical'or ground wood pulp and a substance which serves both as a filler and as an age deterrent.
  • Paper containing any substantial amount of mechanical or ground wood pulp has, been found ordinarily to deteriorate rapidly with age.
  • certain substances such as sulfites of alkaline earth metals, and particularly calcium sulfite, have been found to have an age deterrent vent the yellowing, due to age and exposure to air and sunlight, of paper containing it.
  • it when added as a filler to paper formed from or containing mechanical wood pulp, it not only enhances the original whiteness of the paper but it tends to preserve such'whiteness.
  • age deterrent fillers of the types contemplated by the present invenpulp having calcium sulfite as an age deterrent filler distributed therethrough'.
  • a composition comprising mechanical wood pulp having at least one sulfite of the group consisting'of calcium sulfite and magnesium sulfite as an age deterrent filler distributed theretion may be produced, reference may be had to said parent Patent No. 2,235,531.
  • These fillers are particularly valuable for paper made from mechanical or ground wood pulp.
  • the reducing action of the calcium sulfite, for example, to- I or an equivalent substance is intended, and that the claims are not to be restricted to calcium.
  • the improved pigment or flller in the production of paper. it may be added to the tion of paper therefrom a finelydivided filler including calcium sulfite as an age deterrent.
  • a method of deterring the aging of paper containing mechanical wood pulp which comprises intermixing with the pulp prior to formation of paper therefroma a finely divided filler including at least one sulfite of the group consisting of calcium sulfite and magnesium sulfite as an age deterrent.
  • a method of deterring the aging of paper containing mechanical wood pulp which comprises introducing between the fibers thereof a finely divided filler including at least one sulfite of the group consisting of calcium sulfite and magnesium sulfite as an age deterrent.

Description

Patented Nov. 10, 1942 2,301,452 PULR COMPOSITION AND PAPER.
Joseph E. Plumstead, Wilmington, DeL, assignor, by mesne assignments, to West Virginia Pulp & Paper Company, New York, N. Y., a corporation of Delaware No Drawing. Original application September 4,
1931, Serial No. 561,241. Divided and this application June 29, 1940, Serial No. 343,095
9 Claims.
This invention relates to an improved pulp composition and to paper formed therefrom. The present application is a division of my copending application Ser. No. 561,241 filed September 4, 1931, now Patent No. 2,235,531 granted March 18, 1941. In said parent case there are disclosed and claimed methods of producing certain pigment or filler materials.
The invention embraced by the present application relates to a pulp mixture containing mechanical'or ground wood pulp and a substance which serves both as a filler and as an age deterrent.
Paper containing any substantial amount of mechanical or ground wood pulp has, been found ordinarily to deteriorate rapidly with age. However, certain substances such as sulfites of alkaline earth metals, and particularly calcium sulfite, have been found to have an age deterrent vent the yellowing, due to age and exposure to air and sunlight, of paper containing it. Thus, when added as a filler to paper formed from or containing mechanical wood pulp, it not only enhances the original whiteness of the paper but it tends to preserve such'whiteness.
.Other features and advantages of the invention will appear from the detailed description of the same which will now be given.
For a full description of various methods and forms of apparatus by which age deterrent fillers of the types contemplated by the present invenpulp having calcium sulfite as an age deterrent filler distributed therethrough'.
3'. As an article of manufacture a sheet of paper formed at least in part of mechanical wood pulp and containing at least one sulfite of the group consisting of calcium sulfite and magnesium sulfite as-an age deterrent filler.
4, A composition comprising mechanical wood pulp having at least one sulfite of the group consisting'of calcium sulfite and magnesium sulfite as an age deterrent filler distributed theretion may be produced, reference may be had to said parent Patent No. 2,235,531. These fillers are particularly valuable for paper made from mechanical or ground wood pulp. The reducing action of the calcium sulfite, for example, to- I or an equivalent substance is intended, and that the claims are not to be restricted to calcium. In the use of the improved pigment or flller in the production of paper. it may be added to the tion of paper therefrom a finelydivided filler including calcium sulfite as an age deterrent.
8. A method of deterring the aging of paper containing mechanical wood pulp which comprises intermixing with the pulp prior to formation of paper therefroma a finely divided filler including at least one sulfite of the group consisting of calcium sulfite and magnesium sulfite as an age deterrent.
9. A method of deterring the aging of paper containing mechanical wood pulp which comprises introducing between the fibers thereof a finely divided filler including at least one sulfite of the group consisting of calcium sulfite and magnesium sulfite as an age deterrent.
JOSEPH E. PLUMSTE'AD.
US343095A 1931-09-04 1940-06-29 Pulp composition and paper Expired - Lifetime US2301452A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US343095A US2301452A (en) 1931-09-04 1940-06-29 Pulp composition and paper

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US561241A US2235531A (en) 1931-09-04 1931-09-04 Method of producing paper filler
US343095A US2301452A (en) 1931-09-04 1940-06-29 Pulp composition and paper

Publications (1)

Publication Number Publication Date
US2301452A true US2301452A (en) 1942-11-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US343095A Expired - Lifetime US2301452A (en) 1931-09-04 1940-06-29 Pulp composition and paper

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US (1) US2301452A (en)

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