DE1969784U - TRANSPARENT PLASTIC PLATE FOR THE PRODUCTION OF WELDING PROTECTION LENSES, PANELS OR GOGGLES. - Google Patents

Description

FARBENFABRIKEN BAYER AG

LEVERKU S EN-Bayerwerk 3 May 196? Patent department

Transparent plastic plate for the production of white protection panes, blends or glasses

The object of the furnace are transparent plastic plates for the production of white protection glasses made of cellulose esters, with additives harmful rays, which in the Welding work, especially with electrical welding, occurs, be absorbed. E © is known from using dyes embroidered and / or pigmented normally esterified Cellulose acetate sheets, welding protection glasses, screens, glasses or windows that have a Absorption of harmful rays (U.T. radiation, thermal radiation) exhibit.

As a result of its excellent transparency and good colorability, cellulose acetate is particularly suitable for the production of such articles. Clay specialist part, however, is the low esterification (<55 $> acetic acid content) and the high plasticizer content O 20 # plasticizer) of the normally esterified cellulose acetate used up to now. As a result, the softening point is relatively low, so that considerable deformations can occur if the radiant heat occurs intensively.

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The object of the innovation is now a transparent plastic plate for the production of white protection glasses, visors or glasses with a content of radiation absorbers, soot and dyes, which is made of organic cellulose esters with a Yicat heat resistance of at least 104 ⁰ C (determination of Yicat -Heat resistance see DII 53 460), *

The organic cellulose esters used here are highly esterified C @ lluloeeacetate with a content of at least 55 wt .- ^ Acetic acid and a plasticizer content not exceeding 20% by weight, Gellulose propionates with a plasticizer content of at most 10 wt .- ^, cellulose acetate butyrate with a plasticizer content voa at most 10 wt .- ^ and a mixture of cellulose ^ acetobutyrate and cellulose propionate with a plasticizer content of at most 10 wt .- $ used.

The above-mentioned organic cellulose esters contain 0.05 to 1% by weight of radiation absorber, 0.01 to 1% by weight of finely divided carbon black with an average particle size of below 120 liters and optionally 0.01 to 0.3% by weight a dye soluble in organic cellulose esters. Such plates made of the above-mentioned organic cellulose esters show a high heat resistance and are therefore excellent for the production of welding protection panes, screens or

* (see also R. Houwink, Chemistry and Technology of Plastics, Vol. I., pages 651 and 652, 3rd edition, Leipzig 1954).

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-Suitable for glasses. Depending on the intended use , panels with a thickness of 0.3 to 4 mm can be used.

The following compounds are preferred as radiation absorbers suitable! Benzotriazole derivatives, benzophenone derivatives and substituted acrylonitrile derivatives.

The following dyes soluble in organic cellulose esters are preferably used: Heliogengrtin (Color Index I, 2783), Heliogen blue (Color Index I, 2773).

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Example 1s

There are 82.700 wt .- $ of an Celluloseaeetates with an acetic acid content of 56 $ and 17 §ew .- ^ plasticizer on the Baeis a phthalic acid ester, 0.241 wt. -Φ radiation absorber on the Basie a substituted Acrylnitrilderivates, 0.030 wt .- ^ Heliogengrtin and 0.029% by weight of carbon black with an average particle size of below 120 Å and mixed on a hot roller, for example. generally plasticized, homogenized and then granulated in an extruder. The granulate obtained in this way is then processed into sheets in an injection molding or extruder process. The Yicat heat resistance of these plates is 104 ⁰ C.

Example 2;

Analogously to Example 1, 92%, 20% by weight of cellulose propionate and 7.500% by weight of plasticizer based on a phthalic acid ester, 0.241% by weight of radiation absorber based on a substituted acrylonitrile derivative, 0.030% by weight of heliogen green and 0.029% by weight were used Weight .- ^ carbon black (approx. 120 i) processed into 2 mm thick plates. Vicat heat resistancei 104 ⁰ C.

Example 3:

According to Example 1, 96,200 wt .- # cellulose acetobutyrate and 3,500 wt .- ^ plasticizer based on an adipic acid

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* reesters, 0.241 wt .- ^ radiation absorber based on a substituted acrylonitrile diYates), 0.030 wt .- ^ heliogem green and 0.029 wt .- ^ carbon black processed to 2 bim thick plates. Yicat heat resistance ι 105 ⁰ C.

Example 4:

According to the method of the Bespiels 1, from 12,000 wt .- ^ Celluloseacetobutjrat, 82.200 weight cellulose propionate, 5 ₉ wt .- ^ 5OO plasticizer on the basis of adipic acid, phthalic acid-Eeter-Gemisehes, 0.241 wt .- ^ radiation absorber on the basis of of a substituted acrylonitrile derivative, 0.030 wt. - $> Heliogen green and 0.029 $ carbon black (120 Å) 2 mm thick plates. Vieat heat resistance: 105 ⁰ C.

A 2 mm thick plate produced according to Examples 1 to 4 shows the following light transmittances:

a) Spectral transmittance T / \ s

4r / r

Λ
313 nm nm 2 TK
χ 10 "" ⁶ 365 nm 1 χ 10 " ⁶ 405 nm 5.4 χ ΙΟ " ⁴ 555 nm 0.093 565 nm 0.086 589 nm 0.040 671 10 733 0.020 Le A '

i 5 *

Total transmittance

in the visible and ^/ T _UR in the ultra-red spectral region: 0.055 * AtK ± 5 *

c) Selective permeability for wavelengths: A 365 nm ⁷ T ^ <2 ι 10 " ⁶ ^

A.313 nm ^ ^ <1 χ 10

" ⁶

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Claims (8)

^ ϊ ί? Protection claims; 1. Transparent plastic plate for the production of Sehweißersohutz »Panes ₉ screens or glasses made of cellulose esters with a content of radiation absorbers ₉ carbon black and dyes, characterized in that the plastic plate consists of an organic cellulose ester with a Yicat heat resistance of at least 104 C. 2. Transparent plastic plate according to claim 1, characterized characterized in that the plastic plate is made from a cellulose acetate with an acetic acid content of at least 55 # and a plasticizer content of at most 20 percent by weight. 3. Transparent plastic plate according to claim 1, characterized characterized in that the plastic plate is made from a cellulose propionate with a plasticizer content of at most 10 percent by weight consists. 4. Transparent plastic sheet according to claim 1, characterized in that the plastic sheet made of cellulose acetobutyrate with a plasticizer content of at most 10 percent by weight. Le A 10 733 - 7 - 5. Transparent plastic plate according to claim. 1, thereby germinated that the plastic plate consists of a mixture, ■ consisting of cellulose acetobutyrate and cellulose propionate, With a plasticizer content of at most 10 percent by weight consists. 6. Transparent plastic sheets according to claim 1, characterized characterized as being 0.05 to 1 wt. # of a radiation absorber based on a substituted acrylonitrile derivative. 7 · Tram-transparent plastic panels according to claim 1, characterized in that characterized in that it is 0.01 to 1 wt .- ^ of a finely divided Contains soot with a grain size below 120 α « 8. Transparent plastic sheets according to claim 1, characterized characterized in that they contain 0.01 to 0.1 wt .- ^ one in organic Cellulose esters contain soluble dye. Le A 10 733 - θ -