Process of preserving paper

Details Process of preserving paper Process of preserving paper

1998-05-21

2000-06-06

McKane, Elizabeth

Chemical apparatus and process disinfecting, deodorizing, preser

Process disinfecting, preserving, deodorizing, or sterilizing

Process of storage or protection

162135, 528 43, D21H 2518

Patent

active

060714751

DESCRIPTION:

BRIEF SUMMARY
Although the public is little aware of the destruction and degradation, respectively, of paper, caused not least by environmental influences, it is a fact that said degradation of paper gives rise to losses in the order of billions per year worldwide, not to mention that thereby in part also material which is valuable from a cultural and historical point of view gets lost forever. The main reason for that is the presence therein of sulfuric acid caused by the paper manufacturing process, which presence results in a slow but steadily proceeding catalytic hydrolysis of the cellulose skeleton.
There actually are deacidification processes by which said destruction of paper can be slowed down or concealed, but said processes, although arresting the degradation, do not result in a reinforcement. In order to achieve reinforcement (consolidation), each sheet (e.g., of a book) must be treated individually. This is why the processes employed for said purpose so far are laborious and in addition of only limited effectiveness.
Therefore there is an urgent need for a process with which paper and paper products, respectively, particularly (valuable) books, ancient (historic) writings (e.g. documents, maps etc.) but also pieces of art (drawings, etchings, ink paintings, reproductions etc.) and products of the press which are subject to intensive use (e.g. books in libraries, bills) can simply and efficiently be deacidified and at the same time reinforced (in the following globally referred to as "preserved"). Although on principle said reinforcement can be achieved by impregnation with organic polymerizable monomers and subsequent polymerization thereof, leaves, e.g. of a book, in contact with each other will irreversibly stick together as a result thereof. The object of the present invention thus in particular is to provide a process which by a simple impregnation of paper results in a simultaneous deacidification and reinforcement thereof without causing paper layers in contact with each other to stick together.
Surprisingly it has been found that the above object can be achieved by a process for preserving paper, which comprises leaves or webs) which are at least in part in contact with each other with a preservative fluid comprising polycondensates based on one or more hydrolytically polycondensable compounds of elements M of the main groups III to V and the sub-groups II to IV of the Periodic Table, wherein in said polycondensates an organic group G which comprises at least two carbon atoms to each of which at least one atom selected from hydrogen and fluorine atoms is bonded and which does not have any polar substituents, is bonded, either directly via one of said carbon atoms or via a linking group A, to at least 0.1% of the central atoms M; and
In the present invention the term "paper" is to denote products based on felted plant fibers, particularly based on cellulose, wood pulp, straw cellullose, rag cellulose and recycled paper pulp. Said term includes for example graphic papers (e.g. papers for writing and printing). Of course, other products such as Kraft paper, cardboard and paperboard may also be treated by the present process although in the latter cases an effective preservation will in most cases not be necessary.
The above elements M from the main groups III to V and the sub-groups II to IV of the Periodic Table include, e.g., at least one element selected from silicon, aluminum, boron, tin, zirconium, vanadium and zinc, Si, Al and Zr being preferred. In particular, preferably 75% to 100% and particularly preferred 90% to 100% of all central atoms of the polycondensates present in the coating composition are silicon, aluminum and/or zirconium atoms.
According to the present invention organic groups G which feature at least 2 (and preferably at least 3 and particularly at least 5) carbon atoms to each of which at least one and preferably at least two atoms selected from hydrogen and fluorine atoms are bonded and which do not have any polar substituents are bonded to at least 0.1% (preferably at least 0.5

REFERENCES:
patent: 5482781 (1996-01-01), Wittekind et al.
patent: 5644014 (1997-07-01), Schmidt et al.

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